直江兼続
In 1600, Ieyasu charged the Date to fight against Uesugi Kagekatsu; and, with the assistance of Mogami Yoshiteru, Masamune's forces defeated Naoe Kanetsugu. In recognition of this success in battle, Masamune was granted the fiefs in twelve districts which had been held until that time by the Uesugi clan. The Date established themselves at Sendai (620,000 "koku"). By 1658, Masamune changed the name of the Uesugi's castle at Iwatezawa to Sendai Castle. The "feudal daimyō" were sometimes identified with the suffix "-kō" (duke, ruler of the land), preceded by the name of a place or a castle, e.g., Sendai"-kō" was one of the names by which Date Masamune was known.