FUJIWARA no Sanesuke who is said to be Keien's nephew appreciated Keien as 'a skillful man' and frequently visited Keien from when he was young and left Ryoen (Tendai sect), his child born out of wedlock, to Keien's care.
甥とされる藤原実資は「堪能人也」と評価して青年時代から慶円の元をしばしば訪れて庶子良円(天台宗)を託した。