Jōgon 淨嚴 (1639–1702), Shingon scholar of the late 17th c. and the founder of the Shingon Risshū 真言律宗 reform movement which aimed to restore strict monastic discipline alongside the Shingon esoteric ritual practice. Born in Kawachi (modern Osaka prefecture), he trained at the Daigo-ji in the Sambō-in lineage and later founded the Reiun-ji 靈雲寺 in Edo, the head temple of the Shingon Risshū. He served as personal Buddhist tutor to the shogun Tokugawa Tsunayoshi and produced an enormous scholarly corpus across Vinaya, esoteric ritual, and Sanskrit philology. His Siddham scholarship — principally the Shittan Sanmitsu-shō KR6t0421 — is the most rigorous Japanese Siddham treatise of the early modern period and provided the textual foundation on which modern academic Sanskrit philology in Japan (beginning in the late 19th c.) could build. The DILA authority id is A001257. He died at Reiun-ji in Genroku 15 / 1702, age 64.