Keimyo was a nephew (old brother's son) of FUJIWARA no Arikuni, who was the main person responsible for restarting the second period of Kangakue, and in 1028, he was appointed as the Tendai-zasu and held that post throughout that year.
慶命は第2期勧学会再興の中心であった藤原有国の甥（兄の子）で、長元元年（1028年）に天台座主に補されて同年間中は一貫してその地位にあった。