Answer
The answer is the Kawachi Genji, a branch of the Minamoto clan that emerged in the late 10th century in the Kawachi Province of Japan. Minamoto no Yoritomo, the founder of the Kamakura shogunate, belonged to this family. The Kawachi Genji played a significant role in Japanese history during the Heian and Kamakura periods and were known for their military prowess and political influence.