Princess Masako (Reizei)
| Princess Masako 昌子内親王 | |
|---|---|
| Empress consort of Japan | |
| Tenure | October 9, 967 – August 1, 973 |
| Empress dowager of Japan | |
| Tenure | 973–986 |
| Grand empress dowager of Japan | |
| Tenure | 986–1000 |
| Born | 950 Heian Kyō (Kyōto) |
| Died | January 10, 1000 (aged 49–50) Heian Kyō (Kyōto) |
| Spouse | Emperor Reizei |
| House | Imperial House of Japan |
| Father | Emperor Suzaku |
| Mother | Hiroko |
Princess Masako (昌子内親王, Masako Naishinnō; 950 – 10 January, 1000), was a princess and an empress of Japan during the Heian period. She was the consort of her cousin Emperor Reizei of Japan. She was the daughter of Emperor Suzaku and Princess Hiroko.