When Yasumori was appointed as provincial governor of Echizen Province on March 7, 1163, the 18-year-old Yasuyori was also dispatched to Echizen, and it is believed that Yasumori granted Yasuyori the family name of Taira around this time.
保盛は長寛元年正月24日付で、越前の国司に任ぜられており、18歳の康頼も越前に派遣されて、この頃に主君から平の姓を賜与を受けたと思われる。