Oda Nobukatsu
In 1590, (Tenshō 18), he was appointed castellan of Kiyosu Castle in Owari Province, where Oda Nobukatsu had once ruled. The following year, Hideyoshi lost his legitimate heir Tsurumatsu (who died before adulthood) and so gave Hidetsugu the position of Imperial Regent. This meant Hidetsugu had to move to Jurakudai in Kyoto, and resulted in a so-called "dual system of government" (二元政治) run by Hideyoshi and Hidetsugu, with the assumption that latter would succeed the former after his death. As Hideyoshi was busy handling the invasion of Korea, Hidetsugu acted in his place to handle domestic affairs.