After Naomasa II succeeded in several military exploits, he accompanied Ieyasu when Ieyasu entered the Kanto area in 1590, and was given the Minowa-jo Castle in Kozuke Province with 120, 000 koku (approximately 21.6 million liters of crop yield).
多くの武功をたて、1590年（天正18年）には家康の関東入府に伴い上野国箕輪城12万石。