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Old French Sign Language

Old French Sign Language (OFSL), also known as vieille langue des signes française (VLSF), was the natural sign language developed and used by the deaf community in Paris during the 18th century, serving as the linguistic foundation for early deaf interactions and education before the standardization of modern French Sign Language (LSF).^[1] It consisted of iconic and gestural signs that allowed deaf individuals to communicate complex ideas, participate in religious and social life, and form a cohesive community, distinct from any imposed spoken language systems.^[2] Emerging organically among deaf tradespeople and families in urban centers like Paris, OFSL reflected local cultural elements, such as visual representations of French nobility and everyday gestures, and predated formal linguistic documentation by centuries.^[1] Signs used by deaf individuals are attested as early as the 16th century in France. By the 18th century, a deaf signing community in Paris had developed a shared lexicon through intergenerational transmission, possibly influenced by earlier monastic sign systems used by hearing monks for silent communication.^[1] By the mid-18th century, a dense network of deaf individuals in Paris—estimated at several dozen—had refined OFSL into a robust language capable of abstract expression, as noted in contemporary accounts of deaf gatherings and markets.^[2] The language's documentation began in earnest in 1779 with Pierre Desloges's publication Observations d'un sourd-muet sur un ouvrage, which described OFSL's pre-existing vitality among uneducated deaf Parisians, countering claims of its invention by educators.^[3] Historical linguistics research highlights OFSL's evolution through processes like lexical simplification and borrowing, with signs such as the one for "king" (roi) shifting from multi-handed diagonal gestures to more streamlined forms over time.^[1] Central to OFSL's preservation and spread was Abbé Charles-Michel de l'Épée, who in 1755 founded the world's first public school for the deaf in Paris after encountering two deaf sisters using the language to communicate.^[3] Rather than inventing signs, de l'Épée immersed himself in OFSL by learning from his students, then augmented it with "methodical signs"—abstract representations of French grammatical particles—to facilitate literacy and spoken language acquisition.^[2] His successor, Abbé Roch-Ambroise Sicard, further refined this hybrid approach, emphasizing OFSL's role in cognitive development.^[3] Key deaf figures like Desloges, a self-taught bookbinder who moved to Paris in 1761 and mastered OFSL in 1769, advocated for its recognition as a full language, arguing it enabled deaf autonomy without reliance on oralism.^[2] OFSL profoundly influenced global sign language development, serving as the progenitor of modern LSF and exporting variants through educators trained in de l'Épée's methods.^[1] Notably, deaf teacher Laurent Clerc brought an OFSL-derived system to the United States in 1816, forming the basis of American Sign Language (ASL), where approximately 60% of core vocabulary retains similarities to 19th-century French signs.^[3] It also spread to Europe (e.g., Danish and Italian schools) and Latin America via missionaries like Édouard Huet, who introduced it to Brazil in 1857 and Mexico in 1867, leading to distinct yet related languages like Brazilian Sign Language.^[4] Despite suppression during 19th-century oralist movements, OFSL's legacy endures in linguistic studies, underscoring sign languages' deep historical roots and resilience.^[1]

History

Origins in Pre-18th Century Paris

Evidence of signing among deaf individuals in Paris dates back to at least the 16th century, as noted by Michel de Montaigne in 1580, who described mutes arguing and storytelling through signs, indicating early gestural communication practices.^[1] The Old French Sign Language (OFSL), also known as vieille langue des signes française (VLSF), emerged spontaneously within the deaf community of Paris by the early 18th century, prior to any formal educational interventions. This natural sign system developed among isolated deaf individuals who formed informal networks to communicate essential aspects of daily life, such as trade, social interactions, and personal exchanges, without reliance on hearing intermediaries. Paris, with its large urban population of approximately 550,000 inhabitants around 1750, provided a conducive environment for such networks to form, as the city's density and economic opportunities drew migrants, including deaf laborers like bookbinders and upholsterers who regularly associated with one another.^[5]^[2] Historical accounts indicate that this community numbered in the dozens by the mid-18th century, many of whom were illiterate and pursued independent professions while relying on a shared gestural language for cohesion. The OFSL was primarily a grassroots invention by deaf users themselves, evolving through everyday use rather than structured teaching, as evidenced by later testimonies from community members who described learning and refining it organically in social settings. While direct pre-1750 documentation is absent—reflecting the undocumented nature of deaf life at the time—evidence of its existence is inferred from retrospective reports by deaf writers who confirmed its widespread adoption among uneducated peers.^[6]^[2] Possible influences on the OFSL included monastic sign systems, which had been used in French religious orders since the medieval period for silent communication among monks under vows of silence; these gestural codes, documented as early as the 10th century, may have intersected with urban deaf networks through shared visual communication practices, though the core of OFSL remained a deaf-driven creation. The lack of written records before the 1750s underscores the oral-visual tradition of the language, with its vitality only becoming apparent when educators like Abbé Charles-Michel de l'Épée encountered and began documenting the pre-existing system in the Parisian deaf community.^[2]

Establishment of Deaf Education and Documentation

In 1755, Abbé Charles-Michel de l'Épée encountered two deaf sisters in a Paris suburb who communicated using a systematic sign language developed within their local deaf community, inspiring him to immerse himself in learning and documenting these natural signs to form the core of his pedagogical system.^[7] This encounter revealed the existence of an established gestural language among deaf individuals, which de l'Épée viewed as a viable medium for education rather than an obstacle.^[8] Building on this foundation, de l'Épée established the world's first free public school for the deaf in Paris in 1760, initially housed in his residence and later formalized as the Institut National de Jeunes Sourds.^[9] At the institution, Old French Sign Language's natural signs were systematically incorporated into instruction, supplemented by de l'Épée's "methodical signs"—invented gestures designed to represent French grammatical structures and facilitate the teaching of reading and writing.^[8] This hybrid approach allowed deaf students to express abstract concepts, marking a shift from oralist methods to sign-based education. De l'Épée's early documentation efforts culminated in his 1776 publication, Instruction des sourds et muets par la voie des signes méthodiques, where he detailed observed community signs and explained their modification into a structured tool for grammar and vocabulary instruction.^[8] The work provided illustrations and descriptions of signs, emphasizing their role in bridging gestural communication with spoken language equivalents. Following de l'Épée's death in 1789, his successor, Abbé Roch-Ambroise Sicard, expanded the school's reach by establishing additional institutions across France and refining sign-based pedagogy.^[10] In 1800, Sicard published Cours d'instruction d'un sourd-muet de naissance, which built on de l'Épée's methods by recording further examples of adapted signs and demonstrating their application in comprehensive lessons for deaf learners.^[11] These records preserved key elements of Old French Sign Language during its institutionalization, influencing subsequent deaf education practices.

Evolution and Decline

In the late 18th century, Old French Sign Language (OFSL), the natural sign system used by Deaf communities in Paris, began blending with Abbé Charles-Michel de l'Épée's "methodical signs"—iconic gestures designed to represent elements of spoken French grammar and syntax. This integration occurred primarily in educational settings at the National Institution for Deaf-Mutes in Paris, where l'Épée and his successors combined OFSL's existing lexicon with these supplementary signs to facilitate literacy and spoken language acquisition. By the early 1800s, this fusion had created a transitional signing system that retained much of OFSL's core vocabulary while incorporating grammatical markers aligned with French word order, marking the initial shift toward a more formalized language structure.^[1] Deaf educators trained in this evolving system, such as Laurent Clerc, played a pivotal role in its transformation by exporting modified versions abroad. Clerc, a prominent graduate of the Paris school, traveled to the United States in 1816 and introduced an adapted form of the blended signs to American Deaf education, where they further evolved independently. This international dissemination contributed to the dilution of pure OFSL in France, as key proponents like Clerc remained overseas, allowing regional variations and educational reforms to reshape the language domestically. Meanwhile, figures like Pierre Desloges had earlier advocated for preserving natural signs against excessive methodical overlays, emphasizing community-driven usage over institutional impositions. The 19th century saw a sharp decline in OFSL's prominence due to the rise of oralism, a pedagogical approach prioritizing spoken language and lip-reading over signing. This shift intensified after the Second International Congress on Education of the Deaf in Milan in 1880, where resolutions declared oral methods superior and recommended banning sign language in schools to promote societal integration. In France, these policies led to the widespread adoption of oralist curricula in Deaf institutions, phasing out methodical signs and natural OFSL variants by the late 19th century, resulting in the loss of Deaf teachers' roles and a fragmentation of signing practices.^[12] Despite this suppression, fragments of OFSL survived within family-based and regional Deaf communities, particularly in urban centers like Paris, where informal social networks sustained transmission outside formal education. These remnants influenced the gradual standardization of French Sign Language (LSF) as a distinct modern system by the late 19th and early 20th centuries, incorporating evolved vocabulary while preserving core gestural elements from its Old French roots. LSF's recognition as France's official sign language in 2005 further solidified this continuity, though pure OFSL had largely faded from everyday use.^[1]

Linguistic Structure

Grammar and Syntax

Old French Sign Language (OFSL) likely employed spatial elements common to early sign languages, using the signing space to indicate relationships between elements, such as through verb modifications that incorporated directionality.^[1] Descriptions of OFSL suggest a structure that prioritized contextual elements over strict linear order, differing from spoken French. This may have involved establishing topics spatially before providing related information. Non-manual features, such as facial expressions and body orientation, probably contributed to conveying questions, negation, and modifications, though direct evidence is limited. Classifier handshapes, representing categories of objects and their handling in space, are inferred as part of OFSL based on features in descendant languages.^[1] Note that detailed grammatical analysis of OFSL relies on historical reconstructions due to sparse contemporary documentation.

Lexicon and Phonology

The phonological structure of Old French Sign Language (OFSL) is understood through modern frameworks applied to historical data, characterized by parameters including handshape, location, movement, orientation, and non-manual features.^[13] These allowed for meaningful distinctions, with location often tied to iconicity, such as signs related to oral activities near the mouth. Non-manual features modulated signs for emphasis or grammar.^[13] The core lexicon of OFSL consisted primarily of iconic and arbitrary signs developed by deaf communities in 18th-century Paris. These covered practical domains like family, work, and emotions, reflecting community needs.^[1] While influenced by regional gestures, most were deaf innovations. OFSL incorporated borrowings from monastic sign systems, particularly Cistercian signs, for religious concepts, such as gestures simulating prayer.^[14] These were adapted in educational contexts. Over time, these elements evolved in modern French Sign Language, with changes in movement and handshapes.^[13]

Comparison to Modern French Sign Language

Modern French Sign Language (LSF) descends directly from Old French Sign Language (OFSL), retaining significant lexical continuity in core vocabulary such as numbers, family terms, and basic actions, though exact retention rates are not established due to limited documentation of OFSL. Archaic variants may persist in regional dialects.^[1] Phonological developments in LSF include simplifications from 19th-century standardization, such as reduced use of two-handed signs and spatial complexity compared to inferred OFSL forms. Modern LSF often uses one-handed variants and efficient movements.^[15] Syntactically, LSF shows influences from French through education, incorporating more linear orders in some contexts, while OFSL is reconstructed as more spatially oriented with topic-comment structures.^[16] Lexically, LSF has expanded with loan signs from other languages, including ASL, for modern concepts like technology, beyond OFSL's focus on daily and religious themes.^[1]

Key Figures and Contributions

Abbé Charles-Michel de l'Épée

Abbé Charles-Michel de l'Épée (1712–1789) was a French Catholic priest whose work in deaf education marked a pivotal shift toward recognizing and systematizing sign language as a legitimate medium of instruction.^[17] Born into a family of jurists in Versailles, he initially pursued a career in law before entering the priesthood in 1737, driven by a commitment to serving the marginalized.^[18] In 1759, after the death of their tutor Père Vanin, de l'Épée began instructing two deaf sisters from a poor family who communicated through gestures, an experience that profoundly motivated him to abandon traditional oral-focused approaches and dedicate himself to educating deaf individuals using visual methods.^[17]^[19]^[9] De l'Épée's key contributions began with immersing himself in the natural signs used by his deaf students, learning Old French Sign Language (OFSL) directly from them rather than inventing a system from scratch.^[18] To bridge the gap between OFSL and spoken French grammar, he developed "methodical signs"—a structured overlay of invented gestures onto existing signs to explicitly convey French syntactic elements, such as articles (le, la, les), verb tenses (past, present, future), and prepositions.^[17] These methodical signs, influenced by both monastic signing traditions and Enlightenment ideals of universal language, allowed for more precise teaching of abstract concepts while preserving the core of OFSL's natural expression.^[13] By prioritizing signs over oralism, de l'Épée emphasized comprehension and communication for deaf learners, an innovation that challenged prevailing views and laid the groundwork for sign-based pedagogy across Europe.^[17] In 1760, de l'Épée established the world's first free public school for poor deaf children in Paris, providing education without charge and focusing on sign language immersion to foster literacy and religious instruction.^[17]^[20] This institution not only offered practical training but also trained teachers who disseminated his methods internationally, influencing deaf education in countries like Germany, Spain, and beyond.^[13] His educational philosophy, rooted in empathy for the deaf community's lived experiences, promoted the idea that sign language could enable full intellectual and moral development, countering societal prejudices of the era.^[18] De l'Épée's publications further solidified his legacy by documenting OFSL and his pedagogical innovations. In his seminal 1784 work, La véritable manière d'instruire les sourds et muets, confirmée par une longue expérience, et à présent adoptée dans l'éducation des sourds-muets par plusieurs nations, he provided detailed descriptions of natural and methodical signs, including lexical items and grammatical structures, thereby preserving an early record of OFSL's vocabulary and syntax for future generations.^[17] This text, based on decades of classroom observation, served as a foundational resource for educators and linguists, ensuring the transmission of sign-based knowledge despite later shifts toward oral methods.^[18]

Pierre Desloges

Pierre Desloges (1742 – death date unknown) was a French deaf author and bookbinder whose writings provided an early insider's defense of sign language used by the deaf community in Paris, now recognized as Old French Sign Language (LSF). Born in September 1742 in Le Grand-Pressigny in the Touraine region, Desloges lost his hearing and speech at age seven due to complications from smallpox. Largely self-educated after this event, he apprenticed as a bookbinder and moved to Paris around age 19, where he worked in the trade while living in relative isolation from other deaf individuals. In 1769, at age 27, Desloges learned Old French Sign Language from an illiterate deaf Italian immigrant working as an engraver's assistant; this encounter rapidly integrated him into Paris's vibrant deaf community, where he discovered a rich, pre-existing gestural system that enabled fluid communication among deaf artisans and laborers.^[2] Desloges's seminal contribution came in 1779 with the publication of Observations d’un sourd et muët sur un cours élémentaire d’éducation des sourds et muets, publié en 1779 par M. l’Abbé Deschamps, the first book authored by a deaf person in France and a direct response to the Abbé Deschamps's critique of sign-based education. In this work, Desloges argued that Old French Sign Language constituted a natural and fully developed linguistic system, independent of and predating any inventions by hearing educators, capable of conveying abstract concepts, emotions, and complex narratives with precision and economy. He illustrated its expressive capacity through vivid examples, such as signs for philosophical ideas like "infinity" or "virtue," which combined iconic gestures with metaphorical extensions to rival spoken language in depth. Desloges emphasized that this sign system had organically evolved within deaf communities long before formal interventions, serving as a universal medium adaptable across cultures while rooted in shared human experience.^[21]^[22] As an advocate, Desloges sharply criticized the over-reliance on "methodical signs"—artificial gestures tied to spoken French grammar, as promoted by hearing educators like Abbé Charles-Michel de l'Épée—contending that they hindered natural expression and imposed unnecessary barriers on deaf learners. Instead, he championed the use of "pure" deaf signs in education, asserting their inherent efficiency, logical structure, and ability to foster independent thought without verbal crutches. Desloges portrayed Old French Sign Language as not only practical for daily and intellectual discourse but also inherently democratic, enabling deaf individuals to engage in philosophy, politics, and literature on equal footing with hearing society. His arguments underscored the language's universality, noting its intuitive accessibility to deaf people worldwide, while highlighting its role in building social bonds within Paris's deaf circles.^[21] Desloges's publication marked the emergence of a distinct deaf voice in French intellectual discourse, empowering the community by validating their linguistic heritage and challenging hearing-dominated narratives on deafness. As the first deaf-authored text in France, it instilled a sense of pride and collective identity among deaf readers, demonstrating that sign language users could articulate sophisticated defenses of their culture. This work laid foundational groundwork for subsequent deaf advocacy, influencing 19th-century movements for linguistic rights and self-representation by establishing sign language as a legitimate, autonomous system worthy of preservation and study.^[21]

Legacy and Influence

Impact on French Sign Language

Old French Sign Language (OFSL) served as the foundational base for modern French Sign Language (LSF), contributing the majority of its early lexicon and core spatial grammar during the standardization efforts in deaf schools from the late 18th to early 19th centuries.^[3] Deaf communities in Paris had developed OFSL as a natural sign system prior to formal education, which Abbé Charles-Michel de l'Épée encountered and incorporated into his teaching methods at the National Institution for Deaf-Mutes in 1755.^[1] This pre-existing lexicon, including iconic and multi-articulated signs, formed the core vocabulary that persisted into LSF, with studies estimating significant overlap in basic terms between historical and contemporary forms.^[4] The integration process began when deaf students at de l'Épée's and successor Roch-Ambroise Sicard's schools introduced OFSL signs, which were then blended with "methodical signs"—pedagogical gestures designed to mirror French grammatical structures.^[3] This hybrid approach, emphasizing signed representations of spoken French syntax, evolved into a cohesive system by around 1800, as educators adapted natural signs for classroom use while preserving OFSL's spatial principles for non-manual features and verb agreement.^[4] The result was a standardized LSF that retained OFSL's visual-spatial grammar while incorporating methodical elements to facilitate literacy instruction.^[3] Following the decline associated with oralist policies after 1880, LSF experienced a revival in the 20th century, particularly with official recognition efforts starting in the 1970s, which reintegrated OFSL elements into regional variants.^[23] Linguistic documentation and Deaf community activism during this period emphasized preserving historical signs, leading to their reincorporation in educational and cultural practices across France.^[1] By the 1980s, LSF's status as a distinct language prompted renewed interest in its roots, allowing archaic OFSL features to influence contemporary dialects in areas like northern and southern France.^[23] In current LSF usage, archaic signs from OFSL appear in storytelling, historical reenactments, and cultural performances, maintaining continuity with Deaf heritage.^[1] For instance, older multi-handshape forms, such as those for royal or medieval concepts, are occasionally employed to evoke historical narratives, underscoring LSF's evolution while honoring its origins.^[3] This preservation ensures that OFSL's contributions remain embedded in LSF's expressive traditions.^[1]

Transmission to American Sign Language

The transmission of Old French Sign Language (OFSL) to American Sign Language (ASL) primarily occurred through the efforts of Laurent Clerc, a Deaf educator from the Institution Nationale des Sourds-Muets in Paris, who traveled to the United States in 1816 alongside Thomas Hopkins Gallaudet. Clerc, a graduate of the school founded by Abbé Charles-Michel de l'Épée, brought with him an evolved form of OFSL, which had been systematized and expanded through educational practices in Paris. Upon arriving in Hartford, Connecticut, Clerc co-founded the American School for the Deaf (now the American School for the Deaf), where he taught using signs derived from this tradition, introducing them to American Deaf students who had previously relied on home signs and informal gestures.^[24]^[25] A significant portion of early ASL vocabulary was borrowed directly from OFSL via Clerc's instruction, with estimates indicating that approximately 60% of the ASL lexicon derives from early 19th-century French Sign Language elements rooted in OFSL.^[26] This borrowing is evident in basic lexical items, such as the signs for numbers 1 through 10, which mirror OFSL forms (e.g., the index finger extended for "one" and crossed fingers for "two"), and family terms like "mother" (tapping the chin with the thumb) and "father" (tapping the forehead with the thumb).^[27] These signs formed the core of the "French method" adopted at the Hartford school, emphasizing visual-gestural communication over oralism.^[28] The integration of OFSL into American Deaf communities led to a creolization process by the 1820s, blending Clerc's introduced signs with local American home signs and minor British influences to create a distinct ASL. This synthesis retained key OFSL grammatical features, such as directional verbs that indicate subject-object relationships through movement. The resulting language evolved rapidly among students at the Hartford school and spread to other institutions, establishing ASL as a standardized system.^[28]^[25] Documentation of this transmission appears in Clerc's personal journals from his 1816 voyage and subsequent years, which detail his teaching methods and the adaptation of signs, as well as Gallaudet's records, which describe the "French method" as the foundational approach for Deaf education in America.^[29] These primary accounts highlight how OFSL signs were deliberately taught and modified to suit American contexts, ensuring their enduring influence on ASL.^[24]

Broader Global Effects

The dissemination of Old French Sign Language (OFSL) features extended to other European sign languages through 19th-century educational exchanges originating from Parisian deaf schools. In the Netherlands, Henri Daniel Guyot, who studied under Abbé Charles-Michel de l'Épée in Paris around 1784, founded the first Dutch deaf school in Groningen in 1790 and introduced a manual method blending natural and methodical signs derived from OFSL practices.^[30] This influence shaped the early development of Dutch Sign Language (NGT), with subsequent schools adopting similar signing systems despite later oralist suppressions from 1880 to 1980.^[31] Similarly, French Belgian Sign Language (LSFB) in Wallonia emerged under the influence of OFSL through shared French-speaking educational networks in the 19th century, incorporating lexical and grammatical elements from Parisian models as deaf instruction spread across Belgium.^[32] Danish Sign Language also shows influence from French Sign Language traditions, stemming from the establishment of the first Danish deaf school in 1808 using methods inspired by de l'Épée's Paris institution. Italian Sign Language (LIS) similarly incorporated elements from French educational models in the 19th century, particularly in northern regions through exchanges with Parisian schools.^[33] Beyond Europe, OFSL-derived signs reached non-European sign languages via French educators and missionaries in the 1800s. In Brazil, Édouard Huet, a deaf teacher from the Paris National Institute for Deaf Youth, arrived in 1857 and taught at the Imperial Institute for Deaf-Mutes, introducing OFSL elements that blended with local gestures to form the foundation of Brazilian Sign Language (Libras); by 1861, the school had grown to 17 students, embedding these signs in Libras' lexicon and syntax.^[34] Huet later established Mexico's first school for the deaf in Mexico City in 1867, further spreading French-influenced signing to Mexican Sign Language (LSM).^[35] In Ireland, Catholic nuns from St. Mary's School for Deaf Girls traveled to France in 1846, adopting aspects of 19th-century French Sign Language—including a one-handed fingerspelling system—that integrated into Irish Sign Language (ISL) alongside British influences, particularly in Catholic deaf education from the 1840s onward.^[36] OFSL contributed to the understanding of sign language universals, particularly in spatial syntax, where signing space establishes referential loci for subjects, objects, and verb directions—a feature documented in OFSL's early grammatical descriptions and echoed across global sign languages since the 20th century.^[37] Linguists studying OFSL's directional verbs and spatial modifications, as noted in 18th-century accounts, have highlighted how these mechanisms exemplify universal principles of visual-spatial grammar, influencing comparative analyses of sign language typology. In the 21st century, revival efforts through digital archives have supported the reconstruction of OFSL, aiding the preservation of endangered sign languages worldwide by providing models for lexical recovery and historical linguistics. Projects like the Creagest initiative (2007–2012) have digitized and annotated historical French Sign Language materials, enabling reconstructions that inform global efforts to document and revitalize fading sign systems via accessible online corpora.^[38] These resources facilitate cross-linguistic comparisons, helping communities preserve spatial and iconic features akin to those in OFSL.^[39]

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