He was considered to be one of the three best calligraphers among ONO no Michikaze and FUJIWARA no Yukinari, and his flowing and dynamic calligraphy style was called 'Saseki' style.
小野道風、藤原行成とともに三蹟の一人で、流麗で躍動感のある筆跡は「佐跡」と呼ばれる。