Margarita de Castro e Souza
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Margarida de Castro e Souza, a 15th century Portuguese noblewoman, was an ancestor of Queen Charlotte, 1744-1818, consort of King George III of the United Kingdom, through her mother Princess Elizabeth Albertine of Saxe-Hildburghausen.
Margarida's speculated (albeit unproven) descent from the racially ambiguous Moors is one of several reasons Queen Charlotte, and consequently the present British Royal Family, is thought to have African ancestry. This, however, is contradicted by genealogists, who trace Margarita's descent to Afonso III of Portugal and a mistress of his called Madragana (Mor Afonso), daughter of the Mozarab (Iberian Christians living under Muslim domination) governor of Faro, Aloandro Ben Bekar who was of Jewish descent from the House of King David.
Margarita married Jean II, count of Neufchâtel (1414-1489), and their issue propagated throughout Europe.