The title can be found in documents prior to the Kamakura Period, such as "Masako Naishinno Eawase" (Poetry matching held by Imperial Princess Masako), "Waka genzaisho mokuroku" (A list of extant books of waka poetry), and "Fukurozoshi" (Notes in a Folder, the collection of poetic lore).
『正子内親王絵合』、『和歌現在書目録』、『袋草子』など鎌倉時代以前の文献にその名が見える。