Tendai
Tendai (天台宗, Tendai-shū) is a school of Mahāyāna Buddhism established in Japan during the early 9th century by the monk Saichō (767–822), posthumously titled Dengyō Daishi, who founded its central temple complex, Enryakuji, on Mount Hiei overlooking Kyoto.[1][2] Drawing from the Chinese Tiantai tradition originated by Zhiyi (538–597), Tendai synthesizes exoteric sutra study with esoteric rituals, emphasizing the Lotus Sūtra as the ultimate teaching that reveals the Ekayana, or One Vehicle, path to Buddhahood for all beings regardless of capacity.[3][4] Saichō's establishment of Tendai marked a shift from the narrower doctrinal focus of Nara-era Buddhism, introducing a comprehensive curriculum that integrated meditation (śamatha-vipaśyanā), vinaya precepts, and tantric practices to foster holistic spiritual training.[1] After studying Tiantai texts in Tang China from 804 to 805 CE, he returned with over 200 scriptures and secured imperial recognition for an independent ordination platform in 822 CE, the first in Japan for Mahāyāna bodhisattva precepts.[1] Mount Hiei's Enryakuji became a prolific training ground, producing monks who later founded major sects such as Jōdo (Pure Land), Zen, and Nichiren Buddhism, earning Tendai the designation as the "mother" of Japanese Buddhist traditions.[2] Central to Tendai doctrine is the principle of ichinen sanzen (three thousand realms in a single thought-moment), positing that every instant of existence encompasses all possible phenomena, unified through the Three Truths of emptiness, provisionality, and the Middle Way.[4][3] This holistic framework supported rigorous ascetic practices, including the kaihōgyō pilgrimage of 1,000 days over seven years, underscoring Tendai's commitment to direct experiential realization over mere scholasticism.[4] While Tendai's monks historically wielded significant political influence—sometimes through armed sōhei warrior-monks—this prominence also led to conflicts, culminating in the temple's destruction by warlord Oda Nobunaga in 1571 before its reconstruction.[1]