Karl Alexander (24 May 1684 – 12 March 1737) was Duke of Württemberg from 1698 until his death.

Born in Stuttgart, he was the eldest son of Friedrich Karl, Duke of Württemberg-Winnental and Eleanore Juliane, Princess of Brandenburg-Ansbach.

He succeeded his father as Duke of Württemberg-Winnental in 1698, and inherited the main Duchy of Württemberg, centered on Stuttgart, from his cousin, Eberhard Ludwig, in 1733.

As a successful army-commander in service of the Kaiser, he converted to Catholicism in 1712. He was militarily successful under Prince Eugene of Savoy in the Spanish War of Succession as well as in the war against the Turks. In 1719 he was appointed imperial governor of Belgrad. As Duke of Württemberg he moved the court back from Ludwigsburg to Stuttgart .

-------------------- Soldiered in the Balkans against the Turks for much of his life.

http://en.wikipedia.org/wiki/Karl_Alexander%2C_Duke_of_Württemberg

in German:

http://de.wikipedia.org/wiki/Karl_Alexander_%28Württemberg%29

Latterly (in)famous for hiring and firing "Jew Suss":

http://en.wikipedia.org/wiki/Jew_Suss