Wilhelmina of Prussia, Princess of Orange (1751–1820), daughter of Prince August Wilhelm of Prussia; niece of previous
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Queen Beatrix abdicated on 30 April 2013, and Princess Catharina-Amalia, as the heiress apparent to her father, assumed the title of Princess of Orange, becoming the first to do so in her own right (Suo jure) since Mary of Baux-Orange.
Kirkhoven (the anglicised form of van der Kerckhove) was the only son of Jehan, Lord of Heenvliet and his wife, Katherine (later created Countess of Chesterfield), both courtiers in the Princess of Orange's household.
William V, Prince of Orange (1748 - 1806), son of William IV and Anne, Princess Royal and Princess of Orange