Kei’un Hyakushu (‘One Hundred Poems by Kei’un’): Kei’un was a monk and poet about whom little is known apart from that he was born at some point between 1293-99 and lived until at least 1369. The poet and critic Nijō Tameyo 二条為世 (1250-1338) designated him one of the ‘Four Guardian Kings of Waka Poetry’along with his father, Jōben 浄弁, who was another poet-monk, Yoshida Kenkō 兼好 (ca 1283 – ca 1352), the author of Tsurezuregusa, and Ton’a 頓阿(1289-1372), yet another poet-monk. He is reputed to have buried the manuscripts of his poetry before his death, so relatively few poems by him survive. While Nijō Yoshimoto 二条良基 (1320-1388) said of his poetry that ‘it loves the refined and is most elegant, while being somewhat old-fashioned in style and effective of form, but grating on the ear’, most of his contemporaries in the Nijō school regarded Kei’un as a poet who produced original work.