As described before, in the Utaawase held in 986, when he was invited to participate with Michinaga and Kinto, he was one year younger than them, and the youngest of all the invited participants.
前述のように寛和2年の歌合では道長・公任とともに招かれたが、道長・公任より1つ年下であった斉信は最年少の召人であった。