
After the birth of his biological son Hideyori, Hideyoshi turned on his nephew and designated heir, the regent Toyotomi Hidetsugu, accusing him of treason on flimsy grounds. Hidetsugu was banished to Mount Kōya and forced to commit suicide, and around 40 of his wives and children were subsequently executed at the Sanjō riverbed in Kyoto. The Toyotomi regime thus lost its leading heir and left the daimyo deeply shaken and distrustful.
Month 7
After being stripped of the office of kampaku and exiled to Mount Kōya, Toyotomi Hidetsugu was ordered by Toyotomi Hideyoshi to take his own life.
7/28
Following Toyotomi Hidetsugu's downfall, Toyotomi Hideyoshi ordered the demolition of Jurakudai, Hidetsugu's residence.
Month 8
Jurakudai was comprehensively dismantled, with some buildings and materials transferred to Fushimi Castle and other sites.
After Toyotomi Hidetsugu took his own life at Mount Kōya, his wives, children, and associates were executed at the Sanjō riverbank in Kyoto. Zuisen-ji was later built on the execution site to memorialize Hidetsugu's family.
Sources 京都国立博物館「豊臣秀次と瑞泉寺」/京都市「都市史22 高瀬川」