A Heian-era Japanese Buddhist monk, one of the eight Tang-pilgrim Japanese monks (nittō hakke 入唐八家 — Saichō, Kūkai, Jōgyō, Engyō, Ennin, Eun, Enchin, Shūei) who undertook Tang study missions during the late 8th and 9th centuries. Birth and death dates not preserved.
He traveled to Tang China in 838 CE as part of the great Japanese embassy of that year (which also included Ennin 圓仁), returning to Japan in 839. He produced an importation catalog (KR6s0109 Chángxiǎo lù, T2163) documenting the texts and Esoteric ritual materials brought back, presented to the Heian imperial court.
Source: KR6s0109 Chángxiǎo lù (T2163); standard Japanese Heian Buddhist scholarly tradition.