Sesson Yūbai

was a Japanese Zen Buddhist monk of the Rinzai sect. This priest and poet who is considered "the first important poet of the Five Mountains.

In China Yūbai started studying Linji Ch'an under Chinese master Issan Ichinei in Japan and later moved to China where he studied with many other teachers. He lived in China for over twenty years (1307–1329). He was imprisoned in Chang'an during the period in which Zen Buddhists were persecuted. Many of the poems were created during or about this period survive; and they form the basis of his reputation. In Bingatshū, the collection of 242 poems includes this one: I do not like praises and honours Nor did I fear disdain I just stayed away. My mind, clear water, My body bound and tied For three years in Chang'an. I sing what I feel in songs In straight words, undecorated. Some of these temples were ranked among the provincial jissatsu by Muromachi shogunate,

Prominent among Yūbai's followers were Akamatsu Norimura (1277–1350) and his son Akamatsu Norisuke (1314–1371).