Zonkaku 存覺 (clerical name Kōgen 光玄, 1290–1373) — eldest son of 覺如 Kakunyo and the most prolific theologian of the early Hongan-ji branch of Shinshū. Disinherited twice by his father (1322, 1338) on doctrinal grounds (his openness to non-Hongan-ji Pure Land traditions, his accommodating attitude toward esoteric practice), Zonkaku spent most of his adult life outside the Hongan-ji proper, teaching in Echizen, Mino, and Kyoto. Despite the disinheritance his theological writings — the Tan-toku-mon KR6t0377, Jōdo shin-yō-shō KR6t0378, Roku-yō-shō 六要鈔, Kemmyōshō 顕名抄, and others — became central to subsequent Shinshū systematic theology, and his encyclopedic learning (in esoteric Buddhism, Tendai scholasticism, Confucianism, and traditional Japanese letters) makes him the most cosmopolitan of the early Shinshū doctrinalists. The DILA authority id is A001239. He died at age 84 in Ōan 6 / 1373.