Charles William Ferdinand (German: Karl Wilhelm Ferdinand, Fürst und Herzog von Braunschweig-Wolfenbüttel) (October 9, 1735 – November 10, 1806), Duke of Brunswick-Wolfenbüttel, was a sovereign prince of the Holy Roman Empire, and a professional soldier who served as a Generalfeldmarschall of the Kingdom of Prussia. Born in Wolfenbüttel, Germany, he was duke of Brunswick-Wolfenbüttel from 1780 until his death. He is a recognized master of the modern warfare of the mid-18th century, a cultured and benevolent despot in the model of Frederick the Great, and was married to Princess Augusta, a sister of George III of Great Britain. The botanical genus Brunsvigia was named in his honour.