According to "Kojidan" (Talks of the Past) written in the Kamakura period, people kept visiting Korechika's residence secretly by night, while serving Michinaga by day, as Korechika was a maternal uncle of Imperial Prince Atsuyasu, who was the first prince in the line of succession to the imperial throne, but once Imperial Prince Atsuhira (later, Emperor Goichijo) was born, nobody visited Korechika's residence.
皇位継承の最短路線上にある親王の外舅である伊周に、世人は昼は道長に仕えても、夜は密かにその屋敷へ参上し続け、それが敦成親王（後の後一条天皇）の誕生後は絶えてなかったと、鎌倉時代の説話集『古事談』は伝えている。