John I, Count Palatine of Simmern Count Palatine of Simmern (1459–1509) Parents Margaret of Guelders Frederick I, Count Palatine of Simmern Children John II of Simmern Siblings Fredrick, Count Palatine of Simmern Rupert, Count Palatine of Simmern Catherine, Countess Palatine of Simmern (1455-1522) Stefan van Palts-Simmern Willem van Palts-Simmern Partners Joan of Nassau-Saarbrücken
