Toyotomi Hidetsugu
Hideyoshi's execution of family members were also one of the reasons for questioning his sanity during this period. Before the birth of his son Hideyori, he had adopted his nephew, Toyotomi Hidetsugu, to be his heir in 1591 because Hidetsugu had helped Hideyoshi in his campaigns. Once Hideyori was born, he ordered Toyotomi Hidetsugu to commit ritual suicide on Mount Kōya, this causing Hideyoshi's only possible heir to be his infant son Hideyori. The people closest to Hidetsugu, such as his family and retainers, were also put to death.