Career
This campaign would be called the Zenkunen War, and would be followed some years later by the Gosannen War. He held the title, passed down from his father, of Chinjufu-shogun, Commander-in-chief of the Defense of the North. Thus he gained much of his knowledge of tactics and strategy.
He fought in the Zenkunen War for twelve years starting in 1051, including the Battle of Kawasaki.
In 1063, Yoriyoshi founded Tsurugaoka Hachiman-gū in Kamakura which was to become, roughly a century later, the primary shrine of the Minamoto clan when they began the Kamakura shogunate.