In 1999, Mario de Valdes y Cocom expanded previous claims in a website developed for PBS Frontline. Valdes claimed that Charlotte had an "unmistakable African appearance" and "negroid physiogomy" that was the result of distant African ancestry. Valdes cited as evidence the 1761 Allan Ramsay portrait and claimed that her distant ancestor, Margarita de Castro e Souza, a 15th-century Portuguese noblewoman who traced her ancestry to King Afonso III of Portugal (1210–1279) and one of his mistresses, Madragana (c. 1230–?), was from a "black branch of the Portuguese Royal House", without providing evidence of this unsubstantiated claim about the de Sousa family. Valdes y Cocom's theory is predicated upon a creative, if not rather implausible reading of Ramsay's portrait and a very literal, ahistorical interpretation of period quotes including Baron Stockmar's comment from the last decade of the queen's life.