Emperador Enclaustrado
Yoshitoki's regency was very quiet and uneventful until the final few years of it. He was aided by his sister, the "nun-"shōgun"" Masako. In 1218, Regent Yoshitoki sent Masako to Kyoto to ask the now Cloistered Emperor Go-Toba if one of his sons, Prince Nagahito, could become Shogun Sanetomo's heir, since he had no children. She was refused.