After his father's death in 1199, Yoriie became head of the Minamoto clan and was appointed Seii Taishogun in 1202. By this time however, the power of the shogun and shogunate had already fallen into the hands of his grandfather Hojo Tokimasa. Yoriie in turn plotted to subjugate the the Hojo clan but failed and was put under house arrest and eventually assassinated in 1204.
Minamoto no Yoriie was succeeded by his younger brother Minamoto no Sanetomo as third shogun of the Kamakura shogunate.
Minamoto no Yoritomo
Minamoto no Sanetomo