Bizen Province
According to the theory of the Gokenin, Matsuda Motokuni, a son of Matsuda Motokuni, took sides with Emperor Godaigo, and he was given Ifuku-go in Mino County, Bizen Province as a reward for the subjugation of the Kamakura Shogunate, and he built Toyama-jo Castle there to make it his base. Meanwhile, the record that Matsuda Moriaki(松田盛明) was Shugo (military governor) in Bizen Province in this period is confirmed, but the relationship with Motoyasu or Motokuni is unclear. In a later period, in 1467 in the time of Matsuda Motozumi(松田元澄) when the Onin War occurred, he took sides with the Akamatsu clan in the Eastern army, and made a great achievement to clear off the Yamana clan in the Western army, which made him the Akamatsu clan's vassal, in a position equivalent to Shugodai (deputy military governor) in Ifuku-go. Because of the Matsuda clan's having built the unchallenged power in the western Bizen Province in around 1483, the Akamatsu clan, the Shugo, was wary of them, and Uragami Norikuni, a family member of Uragami Norimune, who was ordered to hunt down and kill them by Akamatsu Masanori, attacked them. Matsuda Motonari asked the Yamana clan for reinforcements as well as making a sortie from Kanagawa-jo Castle, the new base from 1480, and took control of the Fukuoka-jo Castle (Bizen Province), where Ogamo Yamato-no-kami (the governor of Yamato Province) in the Akamatsu clan's side resided, in the New Year in 1484. Motonari, building on the momentum, he advanced to the east to take control of Mitsuishi-jo Castle, where Uragami Norikuni resided, in March, 1484, with an aim to hold Bizen Province in his hand. But he encountered the Uragami's forces at Tennobara to the east of the Yoshii-gawa River on the way, where he suffered a major defeat at the battle, and he killed himself at Yagami Murayama in Iwanashi County when he was caught up by the Uragami's forces on his way of backdown.