Later, research on Emperor Chokei's succession to the throne made progress, and the opinion that the Emperor appeared in the both collections of poetry did not indicate Emperor Gokameyama but Emperor Chokei became dominant, which encouraged people to make genealogies and history books saying that Emperor Chokei's real mother was Kakimon-in.
その後、長慶天皇の即位の有無をめぐる研究が進む中で、両歌集の今上天皇は後亀山天皇ではなく、長慶天皇であるとの説が有力化し、長慶天皇の生母を嘉喜門院とする系図や歴史書が増加した。