1586: Hideyoshi Becomes Daijō-daijin and Receives the Toyotomi Surname
Hideyoshi was appointed Daijō-daijin, the highest court office, and received the Toyotomi surname from the imperial court, cementing his status as ruler of the realm in both name and substance. That April, Ōtomo Sōrin of Bungo, hard-pressed by the Shimazu, traveled to Ōsaka Castle to plead with Hideyoshi for aid, setting in motion preparations for the following year's campaign to pacify Kyūshū.
Events this year
Month 2
Toyotomi Hideyoshi began building Jurakudai in Kyoto as a government center and residence.
Month 5
Toyotomi Hideyoshi married his sister Asahi no Kata to Tokugawa Ieyasu, creating a marriage alliance between the Toyotomi and Tokugawa. He later sent their mother Ōmandokoro to Okazaki, reinforcing the negotiations that led to Ieyasu's submission with kinship and political guarantees.
Sources 国立公文書館「秀吉への臣従」／東京大学史料編纂所『大日本史料 第十一編之二十九』
10/27
Tokugawa Ieyasu entered Osaka Castle and met Toyotomi Hideyoshi, entering the daimyō order under the Toyotomi government.
Toyotomi Hideyoshi was appointed daijō-daijin, the highest office of the imperial court.