Ennin (793 -864), better known in Japan by his posthumous name, Jikaku Daishi, was a priest of the Tendai school of Buddhism in Japan, and its 3rd Zasu ("Head of the Tendai Order"). Ennin was instrumental in expanding the Tendai Order's influence, and bringing back crucial training and resources from China particularly Esoteric Buddhist training, and Pure Land teachings. Ennin was in China during Great