About “Shūi Wakashū”
The Shūi Wakashū, often abbreviated as Shūishū, is the third imperial anthology of waka poetry from Heian period Japan. It was compiled by Emperor Kazan around 1005. Its twenty volumes contain 1,351 poems, expanding on Fujiwara no Kintō's Shūishō. The details of its publication and compilation remain unclear. (Summary adapted from Wikipedia, CC BY-SA 4.0.)