Saicho

Saicho, honoured by the posthumous title Dengyo Daishi, is, with his contemporary Kukai, one of the two monks who transformed Japanese Buddhism at the opening of the Heian period. Ordained young and dissatisfied with the corruption of the established Nara schools, he withdrew to Mount Hiei near the new capital, and in 804 travelled to China, on the same embassy as Kukai, where he received transmission in the Tiantai teaching.

Returning, he founded the Japanese Tendai school, centred on the supremacy of the Lotus Sutra and its teaching that all beings possess the capacity for Buddhahood. His great institutional struggle was for the right of Tendai to ordain its own monks under a Mahayana bodhisattva precept platform, independent of the older Nara ordination system, a right granted only after his death, and one that made Mount Hiei the training ground of Japanese Buddhism for centuries. Nearly every major later movement, the Pure Land of Honen and Shinran, the Zen of Dogen, the Nichiren school, was founded by a monk who began on Hiei. Saicho's reform thus seeded, indirectly, almost the whole subsequent history of Buddhism in Japan.

Saicho and Kukai, who between them established Japan's two major new Buddhist schools of the early Heian period, Tendai and Shingon, began as something closer to contemporaries and occasional collaborators than as rivals. Saicho, senior in official standing at the time, initially borrowed esoteric texts from Kukai and sought instruction from him in areas of Esoteric Buddhist practice that Kukai had studied more thoroughly during his own time in Tang China.

The relationship did not hold. Historical sources document a genuine falling out, driven by a combination of doctrinal disagreement over how esoteric teaching should be transmitted, whether through textual study alone or through the more restricted master to disciple initiation Kukai insisted on, and a personal rupture after one of Saicho's own senior disciples, Taihan, left Saicho's community to study directly and permanently under Kukai instead. Kukai's later refusal to continue lending certain key esoteric texts to Saicho, on the grounds that genuine understanding of them required direct initiation rather than reading, is recorded as a specific point of contention between the two men. This documented conflict between the founders of Tendai and Shingon complicates any picture of early Heian Buddhism as a single unified movement, showing instead two ambitious reformers who cooperated only briefly before their approaches to esoteric transmission proved incompatible.