'Record of a Pilgrimage to China in Search of the Law' — Ennin and His Account of Buddhist Training in Tang China
Ennin traveled to Tang China from 838 to 847, studying Tendai Buddhism, esoteric Buddhism, and Pure Land teachings. His 'Record of a Pilgrimage to China in Search of the Law,' compiled after returning to Japan, is a primary historical source recording the society and Buddhism of late Tang China in detail, compared to Marco Polo's 'Travels.' As the third head abbot of Enryakuji on Mount Hiei, he worked to develop Tendai Buddhism and built many temple buildings at Enryakuji.