Margaret of Guelders C15 noblewomen (1436–1486) Parents Catherine of Cleves Arnold, Duke of Guelders Children Catherine, Countess Palatine of Simmern (1455-1522) Fredrick, Count Palatine of Simmern Willem van Palts-Simmern Rupert, Count Palatine of Simmern John I, Count Palatine of Simmern Stefan van Palts-Simmern Siblings Catherine of Guelders Adolf, Duke of Guelders Mary of Guelders Partners Frederick I, Count Palatine of Simmern