Asano Nagamasa was the brother-in-law of Toyotomi Hideyoshi and one of his chief advisors. Asano also fought for Hideyoshi in a number of campaigns during the Sengoku period of the 16th century of Japan.Asano accompanied Hideyoshi in his campaign against the Mōri clan, and fought in Hideyoshi's invasions of Korea. He also fought for Hideyoshi against the Hōjō clan in 1590 and captured Iwatsuki and Edo castles.