|John IV, Count of Nassau|
|Born||1 August 1410|
|Died|| 3 February 1475 64) (aged|
|Spouse(s)||Maria of Loon-Heinsberg|
|Father||Engelbert I of Nassau|
|Mother||Johanna van Polanen|
Count Jan (Johann) IV of Nassau (1 August 1410, Dillenburg –3 February 1475, Breda) 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.
Engelbert I of Nassau was a son of Count Johan I of Nassau and Countess Margaretha of the Marck, daughter of Count Adolph II of the Marck.
Johanna van Polanen was a Dutch noblewoman. She was the daughter of John III of Polanen, Lord of Breda, and his wife, Odilia of Salm. The House of Polanen was a side branch of the still existing House of Wassenaer.
He married Maria of Loon-Heinsberg, Lady of Millen, Gangelt and Vucht (born in 1424), the daughter of John II of Loon, Lord of Jülich, Heinsberg and Löwenberg, on 7 February 1440. They had children, including:
Maria of Loon-Heinsberg was the daughter of John II of Loon, Lord of Jülich, Heinsberg and Löwenberg. Her mother was the second wife of John II, Countess Margaret of Solms-Braunfels.
Anna of Nassau-Dillenburg was a Flemish-German philanthropist.
Johanna of Nassau-Dillenburg was a daughter of Count John IV of Nassau and his wife Maria of Loon-Heinsberg.
Adriana of Nassau-Dillenburg was a daughter of Count John IV of Nassau-Dillenburg and his wife Maria of Loon-Heinsberg.
Year 1451 (MCDLI) was a common year starting on Friday of the Julian calendar.
William I, Count of Nassau-Dillenburg was a count of Nassau-Dillenburg from the House of Nassau. His nickname the Rich refers to him having many children. However, he owned a number of counties: Nassau-Dillenburg, Nassau-Siegen, Nassau-Dietz and Vianden.
The House of Nassau is a diversified aristocratic dynasty in Europe. It is named after the lordship associated with Nassau Castle, located in present-day Nassau, Rhineland-Palatinate, Germany. The lords of Nassau were originally titled "Count of Nassau", then elevated to the princely class as "Princely Counts".
Count Philipp I of Nassau-Weilburg was Count of Nassau in Weilburg, Count of Saarbrücken and Seigneur of Commercy Château bas in 1371–1429.
The Counts of Vianden, ancestors of the House of Orange-Nassau, were associated with the castle of Vianden in Luxembourg.
Johann V of Nassau-Vianden-Dietz was count of Nassau, Vianden and Diez, and Lord of Breda. He was the paternal grandfather of William the Silent.
Engelbert II of Nassau, Engelbrecht in Dutch, was count of Nassau and Vianden and lord of Breda, Lek, Diest, Roosendaal, Nispen and Wouw. He was a soldier and courtier, for some time leader of the Privy council of the Duchy of Burgundy and a significant patron of the arts.
John I, Count of Nassau-Dillenburg was a Count of Nassau in Siegen and Dillenburg, both now in Germany. He was a son of Count Otto II of Nassau and Adelheid or Aleyda, Countess of Vianden.
Henry, Count of Nassau Count of Nassau-Siegen, of Grimborg, Heiger, Westerwald, later of Molsberg, and after his brother's death of Dillenburg. He was a son of Count Otto I of Nassau and Agnes of Leiningen.
Eberhard I was a German nobleman. He was Count of the Mark from 1277 until his death. He was the son of Engelbert I, Count of the Mark en Cunigonde of Blieskastel.
Henry VIII (1465-1513) was a count of Waldeck and the founder of the older line of Waldeck-Wildungen. He was also temporarily governor of the County of Vianden, a possession of the House of Nassau.
Elisabeth of Nassau-Dillenburg was a member of the House of Nassau. She was a daughter of John V of Nassau-Dillenburg and his wife Elisabeth of Hesse-Marburg. Her brothers were Henry III of Nassau-Breda, John of Nassau-Vianden-Dietz, Ernest of Nassau and William the Rich. Her sister was Maria of Nassau.
Henry II, Count of Nassau-Dillenburg was a son of Engelbert I and his wife Johanna van Polanen. In 1442, he succeeded his father as Count of Nassau-Dillenburg, jointly with his brother John IV.
Philip II, Count of Nassau-Weilburg was Count of Nassau in Weilburg and shared briefly the regency of the County of Saarbrücken.
John III of Nassau-Weilburg was count of Nassau-Weilburg as co-regent with his father. He came from the Walramian branch of the House of Nassau.
John II ,, Lord of Jülich, Heinsberg and Löwenberg, son of Godfrey de Heinsberg, Count of Looz, and Philippa of Jülich, daughter of William V, Duke of Jülich, and Joanna of Hainaut. Although John was the first son of Godfrey, he did not inherit the countship of Looz, the title instead going to Arnold of Rumingy.
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