Wilhelm Egon von Fürstenberg-Heiligenberg (2 December 1629 – 10 April 1704) was a German count and later prince of Fürstenberg-Heiligenberg in the Holy Roman Empire.
He was a clergyman who became bishop of Strasbourg, and was heavily involved in European politics after the Thirty Years' War.
He worked for the Archbishop-Elector of Cologne and Louis XIV of France at the same time, and was arrested and tried for treason for convincing the Elector to fight on the opposite side of a war from the Empire.
Source: Eingescannt aus: Mark Hengerer und Elmar L. Kuhn: Adel im Wandel; Oberschwaben von der Frühen Neuzeit bis zur Gegenwart; Band 1,Ostfildern 2006 ISBN 978-3-7995-0216-0 License: CC-PD-Mark PD-old-100-expired