Holstein (German pronunciation: [ˈhɔlʃtaɪn]) (Northern Low Saxon: Holsteen, Danish: Holsten, Latin and historical English: Holsatia) is the region between the rivers Elbe and Eider. It is part of Schleswig-Holstein, the northernmost state of Germany. Holstein once existed as the County of Holstein (German: Grafschaft Holstein; 811–1474), the later Duchy of Holstein (German: Herzogtum Holstein; 1474–1866), and was the northernmost territory of the Holy Roman Empire.