It is said that in 966, he engaged in Genpuku (coming-of-age ritual) and received a cautionary lesson from his grandfather Koretoki at the age of 13 (in fact, Koretoki died in 963, according to "Kugyobunin" (list of upper officers)).
康保（966年）、13歳で元服し、祖父の維時から教戒を受けたという（維時は実際には応和3年（963年）に死去『公卿補任』）。