Count Henry of Nassau-Siegen (9 August 1611 – 27 October/7 November 1652), , official titles: Graf zu Nassau, Katzenelnbogen, Vianden und Diez, Herr zu Beilstein, was a count from the House of Nassau-Siegen, a cadet branch of the Ottonian Line of the House of Nassau. He served the Republic of the United Netherlands in diplomatic missions, as an officer in the Dutch States Army, and as governor of Hulst. Biography Henry was born at on 9 August 1611 as the fourth son of Count John VII ‘the Middle’ of Nassau-Siegen and his second wife, Duchess Margaret of Schleswig-Holstein-Sonderburg. He was baptised on 29 September, also at Siegen Castle. He was educated at the court of the Electoral Palatinate in Heidelberg and the Bohemian court in Prague. With the ‘Winter King’ (Elector Frederick V of the Palatinate, King of Bohemia) Henry fled from Prague to The Hague and studied with the King’s eldest son Frederick Henry since 14 September 1623 at Leiden University. In service of the Dutch Republic Henry became captain of a infantry company in the Dutch States Army on 27 November 1632. On 2 January 1636 he became lieutenant colonel and on 23 March 1647 colonel of the Northern Holland regiment. On 20 April 1640 he also became ritmeester. In the Eighty Years’ War he distinguished himself at the in 1641 and in the Rijk van Nijmegen. He was governor of Hulst since 1645. The Dutch Republic repeatedly called on Henry for diplomatic missions. In 1638, in Paris he delivered the congratulations of the States General of the Netherlands on the occasion of the birth of the Dauphin of France (later King Louis XIV), and requested King Louis XIII on behalf of Prince Frederick Henry of Orange to stand as godparent at the baptism of the latter’s son Henry Louis. In 1643 Henry travelled to Scandinavia. In February he attended the marriage of Count Oxenstierna (a cousin of the Swedish Lord High Chancellor Axel Oxenstierna) in Stockholm. At the court of Queen Christina of Sweden, Henry met his sister Amalia and her husband, field marshal Herman Wrangel af Salmis, governor of Livonia. With a large entourage, Henry travelled to Danzig and Warsaw and returned to the Dutch Republic via Vienna. The purpose of this diplomatic journey has remained unknown. But from a letter it is known that King Władysław IV of Poland, despite his distrust of everything that