Mary of Looz-Heinsberg Dutch countess (1424–1502) Parents Anna von Solms-Braunfels John II of Loon Children John V of Nassau-Siegen Ottilie of Nassau-Siegen Anne of Nassau-Siegen Joanne of Nassau-Siegen Engelbert II of Nassau Adriana of Nassau-Siegen Siblings Thierry of Sayn Gerhard II von Sayn Jacoba of Loon-Heinsberg John of Heinsberg Johann III Herr von Heinsberg Partners John IV, Count of Nassau-Siegen
