The Kingdom of Illyria was a crown land of the Austrian Empire from 1816 to 1849,[1] the successor state of the Napoleonic Illyrian Provinces, which were reconquered by Austria in the War of the Sixth Coalition.

The French Illyrian Provinces had comprised Carniola and western ("Upper") Carinthia as well as the Adriatic territories of Gorizia and Gradisca, Trieste and the Istrian peninsula.

Upon the dissolution of the Provinces, the Austrian government split off Dalmatia and merged the eastern ("Lower") part of Carinthia into what was to become the Kingdom of Illyria.

It also included some territories in northwestern Croatia (present-day Istria County and the Kvarner Gulf islands of Krk, Cres and Lošinj) and northeastern Italy (eastern parts of the Friuli–Venezia Giulia region, i.e. the former Provinces of Trieste and Gorizia and some small parts of Udine around Tarvisio in the north east and Cervignano del Friuli in the south east).

In September (1813), Lattermann was appointed provisional civil and military governor of Illyria (German: Illyrien), a newly reconquered Austrian territory that was yet to be organized as a regular crown land.

[3] After the collapse of Napoleon's France, the Austrian monarchs gained full power over the territory of the former French Illyrian provinces.

[3] Emperor Francis I and Chancellor Klemens von Metternich relied on the current administrative situation in the then abolished Illyrian provinces.

[4] Despite the mistrust, the court took advantage of some local lawyers, such as the knight Leopold Plenčič and Ivan Vilhar, the former French chief in Villach.

The Kingdom of Illyria was gradually mentioned less and less, and officially appeared for the last time in 1849 as a crown land in the March Constitution of Austria.