Wilhelm Otto von Nassau-Siegen

Count William Otto of Nassau-Siegen (23 June 1607 – 14 August 1641), , 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 as an officer in the Swedish Army.

Biography William Otto was born at Dillenburg Castle on 23 June 1607 as the third son of Count John VII 'the Middle' of Nassau-Siegen and his second wife, Duchess Margaret of Schleswig-Holstein-Sonderburg. William Otto studied in Kassel in 1622 together with his elder brother George Frederick. and a third part of the administration of the city of Siegen. After his older half-brother John 'the Younger' had accepted the homage of the city of Siegen for the entire county of Nassau-Siegen on 12 January 1624 and had voluntarily ceded the sovereignty over the Hilchenbach district with and some villages belonging to the and Netphen districts to his younger brother William on 13/23 January 1624, William Otto and his younger brothers accepted only modest appanages. His older brothers John Maurice and George Frederick did not.

During the Thirty Years' War William Otto served in the Swedish Army under Duke Bernhard of Saxe-Weimar. When the latter died in 1639, he bequeathed to William Otto a riding horse and 10,000 Rhineland Thalers. Great-great-grandparents

Philip I of Brunswick-Grubenhagen(ca. 1476–1551)⚭ 1517Catherine of Mansfeld(1501–1535)

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