About the figure of Shotoku Taishi described in the Nihonshoki, Oyama insists that it was created by the monk Doji, who returned to Japan in 718 after having studied in the Tang Dynasty for 17 years, at the request of FUJIWARA no Fuhito and Nagaya no Okimi.
日本書紀における聖徳太子像について、大山説は藤原不比等と長屋王の意向を受けて、僧道慈（在唐17年の後、718年に帰国した）が創作したとする。