1656 establishments in the Holy Roman Empire

Saxe-Weissenfels () was a Duchy of the Holy Roman Empire from 1656 until 1746 with its residence at Weißenfels. Ruled by a cadet branch of the Albertine House of Wettin, the duchy passed to the Electorate of Saxony upon the extinction of the line. thumb|left|Neu-Augustusburg Castle, Weissenfels John George I of Wettin, Saxon prince-elector from 1611 to 1656, had disposed in his testament that while his eldest son John George II would succeed him as elector, his younger brothers should be vested with secundogeniture duchies as an appanage. Therefore, upon his death the Duchies of Saxe-Zeitz, Sa