On June 27, 1582, after crushing Akechi Mitsuhide at Yamazaki, Hideyoshi convened the Kiyosu Conference with Shibata Katsuie, Niwa Nagahide, and Ikeda Tsuneoki. By championing Nobunaga's infant grandson Sanposhi as heir while securing vast territorial gains for himself, Hideyoshi effectively seized the Oda political succession.