平徳子

Shigemori's half-sister who befriends Biwa. She becomes betrothed to Norihito, son of the Emperor. Her younger sister Moriko was married to Lord Fujiwara no Motazane (the older brother of Lord Motofusa) at the age of nine. When he died two years later, Moriko inherited his lands, angering Motofusa.

(Source: Wikipedia)