He is included in the Hyakunin Isshu and was the nephew of Emperor Ichijo's wife, Empress Fujiwara no Teishi.

His father, Fujiwara no Korechika, was promoted to Minister of the Interior (Naidaijin) the following year, but following an incident in which an arrow was shot at Emperor Kazan, he was demoted to the post of governor of Dazai.

Furthermore, in September of the same year, when escorting the Imperial Princess Masako to Ise to become the sacred maiden, their affair was made known to her father the Retired Emperor Sanjo, who censured Michimasa heavily.

[1] On December 6, 1024, Emperor Kazan's daughter, Jōtomo-In was murdered in the night and her body was discovered the following morning.

His poem included in the Hyakunin Isshu is commonly interpreted as Michimasa's response to being barred from visiting the Imperial Princess Masako after her father learned of their affair.