He was a vehement supporter of both Tendai sect and Shingon sect of Buddhism, and that the Imperial sanction was given on June 11, 822 (lunar calendar date) to the project of the building of Daijo-Kaidan (Mahayana ordination center), which was tangling because Sogo (Office of Monastic Affairs) strongly opposed, is said to be due to the efforts of FUJIWARA no Fuyutsugu, YOSHIMINE no Yasuyo, OTOMO no Kunimichi and him.
また、天台・真言両宗の熱心な後援者であり、僧綱の強硬な反対に遭って難航していた最澄の独立大乗戒壇設立構想が、弘仁13年6月11日、勅許を得るに至ったのは、彼および藤原冬嗣、良峯安世、大伴国道らの尽力によるといわれる。