When being appointed to Ukon no shosho (Minor Captain of the Right Division of Inner Palace Guards) in March 1218, Sanetomo firstly called Kagemori and told Kagemori that he was appointed to Akitajo no suke (provincial governor of Akita-jo Castle in Dewa Province).
建保6年（1218年）3月に実朝が右近少将に任じられると、実朝はまず景盛を御前に召して秋田城介への任官を伝えている。