However, among the records which gathered books existing in the Kamakura period, there is a record that 'Selected by Imperial Prince Toneri, one volume of imperial genealogy,' so that it can be thought that it had existed until this time.
が、鎌倉時代に存在する書物を集めた記録では「舎人親王撰　帝王系図一巻」とあり、このころまでは存在したとも考えられる。