The Duchy of Carinthia, known as Herzogtum Kärnten in German and Vojvodina Koroška in Slovene, encompassed parts of southern Austria and northern Slovenia. Established in 976 following its separation from the Duchy of Bavaria, it became the first newly formed Imperial State after the original German stem duchies. Carinthia retained its status as a Holy Roman Empire State until its dissolution in 1806. From 1335, it fell under the rule of the Habsburg dynasty within the Austrian dominions. This continued through its time as a constituent part of the Habsburg monarchy and the Austrian Empire, eventually becoming a crown land of Austria-Hungary until 1918. Following the Carinthian Plebiscite in October 1920, the primary region of the duchy was incorporated into the Austrian state of Carinthia.

Duchy of Carinthia - Wikipedia