Nōin

Tachibana no Nagayasu (橘永愷, 988 – c. 1051), also known was Nōin (能因), was a Japanese poet and monk of the late Heian period.

Along with Izumi Shikibu, Nōin is one of "Thirty-six Medieval Poetry Immortals" of waka poetry selected by Fujiwara no Norikane [ja] (1107–1165).

Nōin authored of the Gengenshu and Nōin Utamakura.

One of his poems is anthologized in the Ogura Hyakunin Isshu: 嵐吹く三室の山のもみぢ葉は     龍田の川の錦なりけり arashi fuku Mimuro-no-yama no momijiba waTatsuta-no-kawa no nishiki narikeriBlown by storm winds, Mt.

Mimuro's autumn leaves have become Tatsuta river's richly hued brocade!