With the destruction of the Gohojo clan by Hideyoshi TOYOTOMI in the Siege of Odawara (1590), TOKUGAWA Ieyasu, who was assigned to govern and develop former Gohojo territories designated Edo as the central place in the Kanto region from where he would govern.
1590年、後北条氏が小田原の役で豊臣秀吉に滅ぼされると、後北条氏の旧領に封ぜられ、開拓の命を受けた徳川家康は、関東地方の中心となるべき居城を江戸に定めた。