It is unknown when the thirty-six poets were selected, but Imperial Prince Munetaka was called 'Kamakura Prince' in the book, which suggests that they were designated after his appointment to Shogun in 1252.
成立年次は不明だが、宗尊親王を「鎌倉宮」としているところから、将軍宣下（建長四年、1252年）以降に成ったものと推測される。