After the ninth regent, Sadatoki HOJO died in 1311, according to his wish, Tokiaki and Takatsuna NAGASAKI acted as guardians for the legitimate child of Sadatoki, Takatoki, who was nine years old.
応長元年（1311年）、9代執権北条貞時の死去にあたり、時顕は貞時から長崎高綱と共に9歳の嫡子高時の後見を託されたという。