Mogami clan (最上氏) were Japanese daimyōs, and were a branch of the Ashikaga family.

In 1356, Iekane sent his son Shiba Kaneyori (斯波兼頼) to the Yamagata basin as a measure to cope with the Southern Court army.

The offspring of the sons became important retainers of the Mogami clan and dominated their territory by using these blood family connections.

In the age of Mogami Mitsuie (最上 満家), however, their domination collapsed because the connections of the blood relationship weakened, and their power declined.

As a reward, he was given 570,000 koku by Ieyasu after the Battle of Sekigahara ended,[2] and the Mogami fief became the fifth largest in Japan, excluding the lands held by the Tokugawa.