Region, western Slovenia. It is located northeast of the head of the Adriatic Sea and includes a mountainous area. Its chief town is Ljubljana. It was part of the Roman province of Pannonia in ancient times and was occupied by the Slovenes in the 6th century AD. In the 13th century it became part of the Holy Roman Empire. In 1335 it became a possession of the Austrian Habsburgs, who held it as a duchy until 1849, when it was recognized as an Austrian crown land (1849–1918). After World War I it was divided between Italy and the new Kingdom of Serbs, Croats, and Slovenes (later Yugoslavia); it was incorporated entirely into Yugoslavia by a 1947 treaty. When Yugoslavia was fragmented in the 1990s, Carniola was included in Slovenia.
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The capital of Carniola, originally situated at Kranj (Krainburg), was briefly moved to Kamnik (Stein) and finally to the current capital of Slovenia, Ljubljana (Laibach).
Carniola formed part of the Roman province of Pannonia; the northern part was joined to Noricum, the south-western and south-eastern parts and the city of Aemona to Venice and Istria. In the time of Augustus all the region from Aemona to the Kolpa river (Culpa) belonged to the province of Savia.
After the fall of the Western Roman Empire (476), Carniola was incorporated into the Kingdom of Italy, and (493) under Theodoric it formed part of the Ostrogothic kingdom. Between the upper Sava and the Soča rivers lived the Carni, and towards the end of the sixth century Slavs settled the region called by Latin writers Carnia, or Carniola meaning 'little Carnia', i.e. part of greater Carnia. Later on the name was changed to Slavic Krajina, Kranjska or, in German, Chrainmark, Krain. The new inhabitants were subjected to the Avars, but threw off their yoke, and joined the great Slavic state of Samo.
Carniola was governed by the Franks about the year 788. When Charlemagne established the margraviate of Friuli, he added to it a part of Carniola. After the division of Friuli, it became an independent margraviate, having its own Slavic margrave residing at Kranj, subject to the governor of Bavaria at first, and after 976 to the Dukes of Carinthia. Henry IV gave it to the Patriarch of Aquileia (1071).
In the Middle Ages the Church held much property in Carniola, thus in Upper and Lower Carniola the Bishop of Freising became in 974 a feudal lord of the city of Škofja Loka, the Bishop of Brixen held Bled and possessions in the valley of Bohinj, and the Bishop of Lavant got Mokronog. Among secular potentates the Dukes of Merano, Gorizia, Babenberg, and Zilli held possessions given to them in fief by the patriarchs of Aquileia. The dukes governed the province nearly half a century. Finally Carniola was given in fief with the consent of the patriarch to Frederick II of Austria, who obtained the title of duke in 1245. Frederick was succeeded by Ulrich III, Duke of Carinthia, who married Agnes of Andech a relative of the patriarch and endowed the churches and monasteries, established the government mint at the city of Kostanjevica, and finally (1268) willed to Ottokar II, King of Bohemia, all his possessions and the government of Carinthia and Carniola.
The French revolutionary troops occupied Carniola in 1797, and from 1805 to 1806. Under the Treaty of Vienna, Carniola became part of the Illyrian provinces of France (1809–1814), with Ljubljana as its capital, and Carniola formed a part of the new territory from 1809 to 1813. The defeat of Napoleon restored Carniola to Austrian Emperor Francis I, with larger boundaries, but at the extinction of the Illyrian Kingdom Carniola was confined to the limits outlined at the Congress of Vienna, 1815. From 1816 to 1849 Carniola was part of the Austrian Kingdom of Illyria with capital in Ljubljana.
In 1918, the duchy ceased to exist and its territory became part of the newly formed State of Slovenes, Croats and Serbs and subsequently part of the Kingdom of Serbs, Croats and Slovenes (later known as the Kingdom of Yugoslavia). The western part of the duchy, with the towns of Postojna, Ilirska Bistrica, Idrija and Šturje was annexed to Italy in 1920, but was subsequently also included into Yugoslavia in 1945. Since 1991, the region is part of an independent Slovenia.
The diocese of Ljubljana or Laibach was established by Emperor Frederick III on 6 December 1461. It was directly subject to the pope. This was confirmed by a Bull of Pope Pius II, 10 September 1462. The new diocese consisted of part of Upper Carniola, two parishes in Lower Carniola, and a portion of Lower Styria and Carinthia; the remaining portion of Carniola was attached to Aquileia, later on to Gorizia and Trieste. At the redistribution of dioceses (1787 to 1791) not all the parishes in Carniola were included in the Diocese of Ljubljana, but this was accomplished in 1833, by taking two deaneries from the Diocese of Trieste, one from Gorizia, and one parish from the Diocese of Lavant, so as to include all the territory within the political boundaries of the crownland.