Catherine I (born Marta Helena Skowrońska; Russian: Екатерина Алексеевна Михайлова; 15 April 1684 - 17 May 1727) was Empress of Russia from 8 February 1725 until her death in 1727. She was previously empress consort of Russia from 1721 to 1725 as the second wife of Peter the Great, and tsaritsa consort from 1712 to 1721.
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