On April 15, 1684 Catherine I of Russia, the widow of Peter the Great the first Russian Empress was born.
Catherine I was the second wife and empress consort of Peter the Great, and Empress Regnant of Russia from 1725 until her death in 1727. (Wikipedia)
- Catherine I | Biography | Saint Peterburg
- Catherine I | Prominent Russians | Russiapedia
- Catherine I | Britannica
- Catherine I | Unofficial Royalty
- Catherine I | Goodreads
- “The Other Catherine: 7 Facts About Russia’s First Empress” | Russian Life