Hōjō Masako in the context of Hōjō Yoshitoki

Minamoto no Yoritomo (源 頼朝; Japanese pronunciation: [mʲi.na.mo.to no (|) jo.ɾʲi.to.mo], May 9, 1147 – February 9, 1199) was the founder and the first shogun of the Kamakura shogunate, ruling from 1192 until 1199, also the first shogun in the history of Japan to hold de-facto power over Japan. He was married to Hōjō Masako, who acted as regent (shikken) after his death.

Yoritomo was the son of Minamoto no Yoshitomo and belonged to Seiwa Genji's prestigious Kawachi Genji family. After successfully maneuvering himself to the position of rightful heir of the Minamoto clan, he led his clan against the Taira from his capital in Kamakura, beginning the Genpei War in 1180. After five years of civil war, the Minamoto clan finally defeated the Taira in the Battle of Dan-no-ura in 1185. Yoritomo established the supremacy of the samurai caste and the first shogunate (bakufu) which was to be centered around Kamakura, thus beginning the feudal age in Japan, which lasted until the 17th century.

Minamoto no Sanetomo (源 実朝; Japanese pronunciation: [mʲi.na.mo.to no (|) sa.ne.to.mo], September 12, 1192 – February 13, 1219, r. 1203–1219) was the third shōgun of the Kamakura shogunate. He was the second son of the Kamakura shogunate founder, Minamoto no Yoritomo. His mother was Hōjō Masako and his older brother was the second Kamakura shogun Minamoto no Yoriie.

His childhood name was Senman (千万). He was the last head of the Minamoto clan of Japan. His Dharma name was Daijijiden seini'i goshoko jingi (大慈寺殿正二位丞相公神儀).