Japanese Tendai monk.scholar, and esoteric practitioner, and fifth abbot of the Enryakuji on Mt. Hiei. Enchin travelled to China in 857 and studied both T'ien-t'ai doctrine on Mt. T'ien-t'ai and esoteric Buddhism in the capital of Ch'ang-an. Upon returning to Japan he began actively promoting Tendai esoteric practice, and became head of the Miidera in 866. Two years later, he was named chief monk of the Tendai school, from which position he petitioned for the Miidera to be made an official temple for esoteric transmissions. This aroused the anger of the Mt. Hiei monks, which led to the split between the Sanmon sect (based on Mt. Hiei) and the Jimon sect (based in the Miidera).