According to the Dai Nihon Komonjo (Old Documents of Japan), he performed copying of a sutra in June 736 for his elder sister, Imperial Princess Inoe who had already become Saigu (Imperial Princess appointed to serve the deities of the Ise-jingu Shrine).
｢大日本古文書」によると、天平8年(736年)の5月、すでに斎宮になっていた姉の井上内親王のために写経をおこなっている。