Jan IV of Nassau
Count Jan IV of Nassau was Count of Nassau, Dietz and Dillenburg. He was the son of Engelbert I of Nassau, Count of Nassau and Dillenburg, Lord of Breda and Johanna van Polanen.
; both were decades dead by 1538-40, when a set of dynastic designs were made in pen with watercolour by Bernard van Orley
He married Maria of Loon-Heinsberg, Lady of Millen, Gangelt and Vucht, the daughter of John II of Loon, Lord of Jülich, Heinsberg and Löwenberg, on 7 February 1440. They had children, including:
- Anna of Nassau
- Johanna of Nassau
- Ottillie of Nassau
- Adriana of Nassau
- Engelbert II of Nassau
- Johann V of Nassau
