"Shitenno-ji Engi"(Legendary history of Shitenno-ji Temple), which is said to be in Shotoku Taishi's own handwriting, is kept in Shitenno-ji Temple, but it is considered to be a forgery created at a later time (the middle of the Heian period.)
『四天王寺縁起』は、聖徳太子の真筆と伝えられるものを四天王寺が所蔵しているが、後世（平安時代中期）の仮託と見られている。