[3] Thanks to this relationship with the ōdono Tadajistsu， Moronaga's political security was guaranteed and he was seen as one of the potential successor of the position of supreme chancellor Kanpaku.

In 1156, Moronaga's father Yorinaga planned a rebellion against Emperor Go-Shirakawa and Fujiwara no Tadamichi.

Quite unfortunately for Moronaga, he became a political enemy of the military strongman Taira no Kiyomori who initiated a coup d'etat in 1179 and took over the power in Japan.

[8] In addition, he was a devoted worshiper of Benzaiten, the patron deity of Musicians in Japanese Buddhism.

According to sinologist Rao Zongyi, Sango Yoroku contains some of the oldest surviving musical scores for the biwa.