William III, Princely Count of Henneberg-Schleusingen

Princely count William III of Henneberg-Schleusingen was a member of the House of Henneberg. He was the son of William II of Henneberg and Catherine of Hanau. William III inherited the princely county of Henneberg in 1440, when his father died in a hunting accident. In 1469, he married Margaret, the daughter of Duke Henry the Peaceful of Brunswick-Lüneburg.