Keikō 敬光 (1740–1795), also known by the sobriquet Kendō 顯道 (“Manifest-Way”) and associated with Mii-dera 三井寺 (Onjō-ji) and the Anraku-in 安樂院 on Mt. Hiei, was the leading Edo-period theoretician of the Tendai yuánjiè (round-precept) school — the Hiei-zan-Anraku-in tradition that maintained Saichō’s institutional vision of an independent Mahāyāna ordination platform, in conscious distinction from the Edo-period Shingon-Risshū of Jōgon 淨嚴 (1639–1702) which advocated joint observance of the Brahmajāla and Sìfēnlǜ precepts. Keikō stands in the lineage descended from Reikū Kōken 靈空光謙 (1652–1739), the founder of the Anraku-in yuánjiè school.
His doctrinal output is gathered as the “seven nets” (qīquán 七筌, “seven nets”) — seven essential works systematizing the Tendai yuánjiè position. The principal surviving works include:
- KR6t0082 Yuánjiè zhǐzhǎng (The Round Precepts at One’s Fingertip, 3 fascicles) — the systematic introduction to the school.
- An 1781 (Tenmei 1) preface to the printed edition of KR6t0068 Yīchéng yàojué of Genshin (源信), where Keikō presents himself as the heir of the Genshin-Eshin tradition and reports that the work had become rare and that “Reki Shōnin” 暦上人 was lecturing on it. He was 41 at the time.
Keikō’s theoretical project was to defend the Tendai exclusive-yuán-jiè doctrine — that the Brahmajāla bodhisattva precepts, received on the Hiei-zan Mahāyāna platform, are themselves a complete and self-sufficient prātimokṣa for the ordained Mahāyāna bhikṣu, without need of subsidiary Sì-fēn-lǜ observance. This position was the major Tendai-side party in the late-Edo precept-controversy.
Within the Kanripo corpus his preserved work is KR6t0082 Yuánjiè zhǐzhǎng.