Due to the factors including the existence of the above Banka, Mokukan (narrow, long, and thin pieces of wood strung together that were used to write on in ancient times) of 'Palace of Prince Nagaya, offering ten pieces of abalone' which was found at the ancient site of the residence of Prince Nagaya, political situations, great achievements in the Jinshin War, the power of his mother's family and huge assets, some say he was Emperor, but not certain.
上記の挽歌、高市皇子の長男・長屋王の邸宅跡から発見された「長屋親王宮鮑大贄十編」の木簡、政治情勢、壬申の乱における功績、母の実家の勢力、莫大な資産などから彼が天皇であったという説もあるが、はっきりとはしていない。