後鳥羽天皇
After the Heian period, during the Kamakura period and later, renga, a form of collaborative linked poetry, began to develop. In the late Heian period, three of the last great waka poets appeared: Fujiwara no Shunzei, his son Fujiwara no Teika, and Emperor Go-Toba. Emperor Go-Toba ordered the creation of a new anthology and joined in editing it. The anthology was named "Shin Kokin Wakashū". He edited it again and again until he died in 1239. Teika made copies of ancient books and wrote on the theory of waka. His descendants, and indeed almost all subsequent poets, such as Shōtetsu, taught his methods and studied his poems. The courtly poetry scenes were historically dominated by a few noble clans and allies, each of which staked out a position.