Mumon Gensen 無文元選 (Genkō 3 → 1323; Genchū 7 / Kōō 2 / 1390-03-12), Late-Kamakura → Nanbokuchō Japanese Rinzai-Zen master, founder (開山) of Hōkō-ji 方廣寺 at Oku-yama 奧山 in Tōtōmi 遠江 province (modern western Shizuoka). Eleventh son of Emperor Go-Daigo 後醍醐天皇 (1288–1339); refused court honours and entered the Sangha. Tonsured under Kōzan 高山 of Hokkaiji; received transmission from Gumei Shōfu (Gǔméi Zhèngyǒu) 古梅正友 of the Yántóu / Wúzhǔn / Xuěyán line at Tiānníngsì 天寧寺 in Yuan China after travelling to the continent c. 1343–1350. On returning to Japan he settled at Oku-yama in 1371 with the patronage of Naitō Yorinao 内藤頼直 and founded Hōkō-ji. Famously refused appointments to major Five-Mountain temples, choosing instead a hermitage-style community focused on intensive zazen and kōan study. Posthumous title Shōkan Kokushi 聖鑑國師 was bestowed by Emperor Meiji at the 500-year memorial in 1893–94. The Hōkō-ji branch (方廣寺派) of Rinzai-Zen, one of the present-day fourteen Rinzai sub-schools, traces its line through him.