Marie Alix, Duchess of Schleswig Holstein
Princess Marie Alix of SchaumburgLippe was the Duchess consort of SchleswigHolstein and the mother of the current Head of the House of Oldenburg, Christoph, Prince of SchleswigHolstein. Marie Alix is the daughter of Prince Stephan Alexander Viktor of SchaumburgLippe and his wife Duchess Ingeborg Alix of Oldenburg. Her paternal grandfather was Georg, Prince of SchaumburgLippe.
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Source: Wikipedia