Waka poems were a popular art form in the Heian period, enough that the famous poet Fujiwara no Sadaie and Emperor Go-Toba sought to put together a selected collection of chosen verses.
was chosen by Emperor Go-Toba 
to select Waka for compilation.
fue designado por el emperador Go-Toba
como seleccionador de wakas.
foi escolhido pelo Imperador Go-Toba
para selecionar os wakas das compilações.