| Prince Masahito | |
|---|---|
| Yōkōin daijō-tennō | |
 Prince Masahito, also known as Yōkōin daijō-tennō | |
| Born | 16 May 1552 |
| Died | 7 September 1586 (aged 34) |
| Spouse |
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| Issue | |
| Father | Emperor Ōgimachi |
| Mother | Madenokōji (Fujiwara) Fusako |
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. He predeceased his father.
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. Kazuhito would become known as Emperor Go-Yōzei.
Later, Go-Yōzei elevated the rank of his father, even though his father's untimely death made this impossible in life. In this manner, Go-Yōzei himself could enjoy the polite fiction of being the son of an emperor.
- 21–25 August 1598 (Keichō 3, 20-24th day of the 7th month): Buddhist rituals were performed in the Seriyoden of the Imperial Palace to celebrate the 13th anniversary of the death of the emperor's father.
The actual site of Prince Masahito's grave is known. 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. It is formally named Tsuki no wa no misasagi at Sennyū-ji.
