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John Louis of Nassau-Hadamar

Count of Nassau-Hadamar
The basics
Occupation Geheimrat
Country Germany
Date of birth Dillenburg
Date of death 1653 Hadamar
Father: John VI Count of Nassau-Dillenburg
Mother: Johannetta of Sayn-Wittgenstein
Brother(s): Philip of Nassau George Count of Nassau-Dillenburg William Louis Count of Nassau-Dillenburg Ernest Casimir I Count of Nassau-Dietz John VII Count of Nassau-Siegen Louis Gunther of Nassau
Children: Maurice Henry Prince of Nassau-Hadamar Johanna Elisabeth of Nassau-Hadamar Sijbilla van Nassau-Hadamar
Authority Library of congress id VIAF id
The details

John Louis of Nassau-Hadamar (Dillenburg, 6 August 1590 – Hadamar, 10 March 1653)
He was the son of van John VI, Count of Nassau-Dillenburg and his third wife Johannetta of Sayn-Wittgenstein.

When his father died in 1606, Nassau was divided amongst his five sons. William Louis received Nassau-Dillenburg, John received Nassau-Siegen, George received Nassau-Beilstein, Ernst Casimir received Nassau-Dietz and John Louis received Nassau-Hadamar.

Marriage and children

He married in 1617 with Ursula of Lippe, daughter of Simon VI, Count of Lippe. They had 14 children, of which 6 survived infancy :

  • Johanna Elisabeth (1619–1647) married Frederick, Prince of Anhalt-Harzgerode
  • Sofie Magdalene (1622–1658) married Louis Henry, Prince of Nassau-Dillenburg
  • Maurice Henry (1626–1679), his successor
  • Hermann Otto (1627–1660), a canon in Trier, Mainz and Cologne
  • Johann Ernst (1631–1651), a canon in Cologne and Münster
  • Franz Bernhard (1637–1695), a canon in Cologne


When John Louis was 28 years old, the Thirty Years' War broke out. He tried in vain to keep Nassau-Hadamar out of the war. His lands suffered from the passage of all kinds of Imperial and Protestant troops, which plundered and requisitioned them into poverty. Highly indebted, John Louis was forced to sell Esterau to Peter Melander Graf von Holzappel in 1643.

John Louis was raised a Calvinist, as was sent in 1629 by his brothers as a diplomat to Vienna to negotiate a truce with Emperor Ferdinand II. Here John Louis converted to Catholicism under influence of Wilhelm Lamormaini. John Louis was much appreciated by the Emperor for his diplomatic skills. In 1638 he successfully led the peace negotiations in Cologne and Munster. In 1645 he was added to the Imperial delegation under Maximilian von und zu Trauttmansdorff who negotiated the Peace of Westphalia. By 1647 he had replaced Trauttmansdorff as head of the Imperial delegation, and it was he who finalized the treaty.

For this, he was awarded the Order of the Golden Fleece by King Philip IV of Spain.

Ferdinand III, Holy Roman Emperor made him a Prince (Fürst) and gave him a large sum of money.

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