Duke of Urach
Wilhelm was promoted to Lieutenant General in 1855. In 1857, he was appointed governor of Ulm. In 1841 he converted to Roman Catholicism to enable his first marriage to Théodolinde de Beauharnais. In 1867, he was promoted to General of the Infantry. On 28 May 1867, he was raised to Duke of Urach (Herzog von Urach), while retaining the dignity of Count of Württemberg.