Hojo Masako

After Yoritomo's death in 1199, Masako became a Buddhist Nun and along with her father Hojo Tokimasa[?] and brother Hojo Yoshitoki[?], usurped all political and military power of the shogunate, relegating the position and title of Seii Taishogun, or shogun, to a mere figurehead.

After the murder of the shogun Sanetomo in 1219, Masako and Yoshitoki suppressed the Jokyu incident of 1221 and installed Kujo Yoritsune as a the fourth shogun in 1226. Controlling the puppet shogun and overall shogunate until her death, Masako became to be called the Ama Shogun or "Nun Shogun".