 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.Kaneyori built Yamagata Castle in about 1360, and won against the Southern Court army in 1367.After that, he settled there and took the name "Mogami", from the town in Dewa Province.