Shōshin 證眞 (c. 1131 – c. 1220, sometimes given as 1136–1220 or 1132–1220), known by his Hiei-zan cloister name Hōjibō 寶地房, was the leading Hiei-zan Tendai exegete of the late Heian period. He is best known for his major three-part Tendai canonical-commentary set: the Hokke gengi shiki 法華玄義私記, the Mahāzhǐguān shiki 摩訶止觀私記, and the Hokke mongu shiki 法華文句私記 — known collectively as the Sandai-bu shiki 三大部私記, a vast personal exegesis of Zhìyǐ’s three principal Tiantai treatises that became canonical in the medieval Tendai exegetical tradition.
Shōshin was associated with the Yokawa 横川 area of Mt. Hiei and was active during the period 1153 (his earliest dated work) to 1214 (his last documented activity). His KR6t0070 Tiāntái Zhēnyán èrzōng tóngyì zhāng (1188) is a programmatic defence of the doctrinal equivalence of Tendai and Shingon, arguing against the rising Shingon claim of esoteric supremacy. Shōshin maintained the Saichō-Sange position — that the two teachings are doctrinally equivalent (nikyō gisei 二教義齊).
He is also the author of an important set of kuden-style works and is generally regarded as the last major systematic Tendai exegete of the Heian period before the emergence of the Kamakura sectarian schisms (Jōdo, Zen, Hokke) drew many Tendai students into new movements.
Within the Kanripo corpus his preserved work is KR6t0070 Tiāntái Zhēnyán èrzōng tóngyì zhāng.