In the Anna Incident in March 969, he worked with Sama no suke (vice-minister of Left Division of Bureau of Horses) MINAMOTO no Mitsunaka to overthrow Sadaijin (minister of the left) MINAMOTO no Takaakira and others.
安和2年（969年）3月の安和の変では左馬助源満仲との協力で、左大臣源高明らを失脚させた。