Final answer:
Minamoto Yoritomo ensured his stay in power by eliminating rivals, establishing the shogunate, and implementing a military bureaucracy.
Step-by-step explanation:
Minamoto Yoritomo, the first shogun in Japan, ensured his stay in power through various means:
- Eliminating Rivals: With the help of the samurai, Yoritomo successfully wiped out all rivals, including the northern branch of the Fujiwara clan.
- Establishing the Shogunate: In 1192, Yoritomo declared himself the shogun, granting him the title of commander in chief and the power to govern the military.
- Implementing a Military Bureaucracy: Yoritomo created a system whereby military men, known as stewards, were placed in charge of estates to manage the lands, resolve disputes, and ensure the loyalty of regional lords.