the imperial court Nōin 能因, lay name: Tachibana no Nagayasu 橘永愷 (988 – c. 1051), late Heian period poet and monk; one of the "Thirty-six Medieval Poetry Immortals" Sei Shōnagon 清少納言 (c. 966–1017), middle Heian Period author, poet and court lady who served Empress Teishi/Empress Sadako; best known as the author of The Pillow Book References Decades and years 01 Poetry by century