The Duchy of Carinthia (; ) was a duchy located in southern Austria and parts of northern Slovenia. It was separated from the Duchy of Bavaria in 976, and was the first newly created Imperial State after the original German stem duchies. Carinthia remained a State of the Holy Roman Empire until its dissolution in 1806, though from 1335 it was ruled within the Austrian dominions of the Habsburg dynasty. A constituent part of the Habsburg monarchy and of the Austrian Empire, it remained a Cisleithanian crown land of Austria-Hungary until 1918. By the Carinthian Plebiscite in October 1920, the main area of the duchy formed the Austrian state of Carinthia. History In the seventh century the area was part of the Slavic principality of Carantania, which fell under the suzerainty of Duke Odilo of Bavaria in about 743. The Bavarian stem duchy was incorporated into the Carolingian Empire when Charlemagne deposed Odilo's son Duke Tassilo III in 788. In the 843 partition by the Treaty of Verdun, Carinthia became part of East Francia under King Louis the German. From 889 to 976 it was the Carinthian March of the renewed Bavarian duchy, though in 927 the local Count Berthold of the Luitpolding dynasty was vested with ducal rights by the German king Henry the Fowler. After Berthold became Duke of Bavaria in 938, both territories were ruled by him. Upon his death in 948 the Luitpoldings, though heirs of the royal Ottonian dynasty, were not able to retain their possessions, as King Otto I bought the loyalty of his younger brother Henry I with the Bavarian lands. Establishment Duke Henry's son Henry II "the Quarreller" from 974 onwards, revolted against his cousin Emperor Otto II, whereupon he was deposed as Duke of Bavaria in favour of Otto's nephew Duke Otto I of Swabia. At the same time Emperor Otto II created a sixth duchy in addition to the original stem duchies, the new Duchy of Carinthia. He reverted the possession of the territories to the Luitpoldings, when he split Carinthia from the Bavarian lands and installed the former Duke Berthold's son Henry the Younger as duke in 976. Over the centuries, the name 'Carinthia' (Kärnten) gradually replaced former 'Carantania'. The realm of the Carinthian dukes initially comprised a vast territory including the marches of Styria (marchia Carantana), Carniola and Istria; they also ruled over the Italian March of Verona