Jan IV of Nassau (1 August 1410, Dillenburg3 February 1475, Breda) was Count of Nassau, Dietz and Dillenburg. He was the son of Engelbert I of Nassau

Engelbert I of Nassau

Engelbert I of Nassau was a son of Count Johan I of Nassau and Margaretha, Countess van der Marck, daughter of Count Adolf II van der Marck.-Early years:...

, Count of Nassau and Dillenburg, Lord of Breda and Johanna of Polanen.

He married Maria, Countess of Loon and Heinsberg, Lady of Millen, Gangelt and Vucht (born in 1424) on 7 February 1440. They had children, including:

• Anna of Nassau (1441-1514)
• Johanna of Nassau (1444-1468)
• Odillia of Nassau (1445-1493)
• Adriana of Nassau (1449-1477)
• Engelbert II of Nassau
  Engelbert II of Nassau
  Engelbert II of Nassau, Engelbrecht in Dutch, , was count of Nassau and Vianden, lord of Breda and Lek, Diest, Roosendaal, Nispen and Wouw...
  
   (1451-1504)
• Johann V of Nassau (1455-1516)