Pope Stephen II
Pope Stephen II (c. 715 – 26 April 757) served as pope from his consecration on 26 March 752 until his death, succeeding Pope Zachary amid escalating threats from the Lombard king Aistulf, who had seized the Exarchate of Ravenna and advanced on Rome.[1][2] Born in Rome to an aristocratic family, Stephen, a Roman priest, was unanimously elected shortly after Zachary's death but faced immediate peril as Aistulf ignored Byzantine imperial pleas and demanded tribute from the papacy.[3][2] Desperate for protection after failed diplomacy with the Lombards and Byzantium, Stephen became the first pope to cross the Alps, embarking on a perilous winter journey in late 753 to seek alliance with Pepin the Short, king of the Franks, who had recently deposed the Merovingian dynasty with papal approval under Zachary.[4][2] At Ponthion in January 754, Pepin vowed under oath to defend the papacy and restore territories historically under St. Peter's protection, including Ravenna and the Roman duchy; in return, Stephen anointed Pepin and his sons Charles and Carloman as kings at the Basilica of Saint-Denis, legitimizing Frankish royal authority independent of Byzantine oversight.[3][5] Pepin's subsequent campaigns in 754–756 forced Aistulf to relinquish captured lands, culminating in the Donation of Pepin, by which the Frankish king granted sovereignty over central Italian territories to the pope, laying the foundation for the Papal States and shifting Western Christendom's geopolitical axis from Constantinople toward the Frankish-papal alliance.[4][6][5] This pact not only secured Rome's temporal independence but also established a model of reciprocal sacral and royal legitimation that influenced medieval European power structures.[7][5]