Hōjō Masako
A year later, Yoriie was assassinated by the Hōjō. Sanetomo was never more than a puppet for his mother Hōjō Masako, who used him as a pawn in her war with her father Tokimasa; Tokimasa tried to depose his grandson a number of times, beginning in 1205, causing Sanetomo to fear for his life thereafter.