Prince Masahito (誠仁親王, Masahito-shinnō, 16 May 1552 – 7 September 1586), also known as Prince Sanehito and posthumously named Yōkōin daijō-tennō, was the eldest son of Emperor Ōgimachi.

Masahito's eldest son was Imperial Prince Kazuhito (和仁親王, Kazuhito-shinnō, 1572–1617), who acceded to the Chrysanthemum Throne on the abdication of Emperor Ōgimachi.

In this manner, Go-Yōzei himself could enjoy the polite fiction of being the son of an emperor.

This posthumously elevated emperor is traditionally venerated at a memorial Shinto shrine (misasagi) at Kyoto.

The Imperial Household Agency designates this location as Yōkōin's mausoleum.