Charles Alexander of Württemberg was a Württemberg Duke from 1698 who governed the Kingdom of Serbia as regent from 1720 until 1733, when he assumed the position of Duke of Württemberg, which he held until his death.

The Kingdom of Serbia was a province (crownland) of the Habsburg monarchy from 1718 to 1739. It was formed from the territories to the south of the rivers Sava and Danube, corresponding to the Sanjak of Smederevo, conquered by the Habsburgs from the Ottoman Empire in 1717. It was abolished and returned to the Ottoman Empire in 1739.