On May 25, 779, three people, Iwatate's wife, Kinoasontatsugu, his son, Kisunujinari SAKANOUE, and his daughter, Akiho made a hand-written copy of a text of Daihannya-haramitsuta in 600 volumes and dedicated that to the late Assistant Governor of Dewa Province, Jugoinoge, and Fourth Order of Merit bearer, Iwatate SAKANOUEKISUN.
宝亀10年（779年）5月1日に、妻の紀朝臣多継、息子の坂上忌寸氏成、娘の秋穂の三人が、故出羽介従五位下勲四等坂上忌寸石楯大夫の厚恩に報じるために、大般若波羅蜜多経1部600巻を写経しておさめた。