The portraits of the five patriarchs of the Shingon Buddhism which Kukai brought to To-ji Temple were authentic paintings of the Tang Dynasty created by Li Zhen and others who were kyutei gaka (court painters) (around AD 806).
空海が東寺に将来した真言五祖像は、宮廷画家の李真などが制作した確実な唐代絵画（ACE806年頃）である。