The Kiyosu Conference.

After the forced suicide of Nobunaga Oda at the Incident at Honnō-ji, powerful figures Katsuie Shibata, Hideyoshi Toyotomi, Nagahide Niwa and Tsuneoki Ikeda meet to decide on a successor. The conference would become Japan's first group made political decision. The meeting was known as the Kiyosu Kaigi.