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At the Cetin Sabor in 1527, the Croatian nobles elected Ferdinand I of the Habsburg dynasty, independently of Hungary, as their king, thus affirming Croatian statehood.
History

Croatia in union with Hungary

(1102–1527)

After the death of the last member of the Trpimirović dynasty, King Stjepan II, there was a battle for the throne in Croatia, which ended with the election of the Hungarian king, Koloman Arpadović, and the contracting of a personal union with Hungary, which lasted until 1918.

Within the new state union, Croatia retained territorial integrity until the reign of Bela IV (1235–79), who founded Slavonia as a new unit of the Croato-Hungarian Kingdom, in the area which was formerly the Duchy of Lower Pannonia. Its clerical seat was Zagreb. At the same time, the Venetians conquered much of Dalmatia, while the regions by the central courses of the River Vrbas and River Sana belonged to Bosnia. After the death of the last Arpadović, a war of succession ensued. The Venetians took the remaining Croatian towns in Dalmatia, while the Bosnian rulers took southern Croatia from the River Cetina to the River Neretva.

In 1309, Croatia came under the rule of Charles I Robert, from the Naples branch of the Anjou dynasty. His son, Louis I (Louis the Great) again united Croatia and Slavonia, seized back the territories occupied by Bosnia (1357) and the Venetians (the eastern shore of the Adriatic from Istria to the Bay of Kotor, in 1358), and enabled economic development and integration processes to take place from the River Drava to the Adriatic Sea.

Croatia in the mid-14th century
The Cetingrad Sabor. At the Cetingrad Sabor in 1527, the Croatian nobles elected Ferdinand I of the Habsburg dynasty, independently of Hungary, as their king, thus affirming Croatian statehood.
Suleiman’s Bridge in Osijek. The most famous Ottoman construction in Croatia. It was built in 1566 according to the designs of Kodža Mimar Sinan and was nicknamed ‘the eighth wonder of the world’. It was burned down by the Croatian ban Nikola VII Zrinski in a conflict with the Ottomans.

During the reign of Louis’ heir, in the late 14th and early 15th centuries, a dynastic war developed, of which the Venetian Republic and Bosnia took advantage, again extending their territories into Croatian land.

It was during this period that Dubrovnik began to arise in the far south of Croatia, built on the foundations of strong maritime, trade and crafts traditions, developing a rich culture, diplomacy, pharmacies and social institutions, and introducing mains water and a sewer system, among other things.

The Bribir Dukes. This noble family from the Šubić line was named after the town of Bribir near Šibenik. They were the strongest feudal family in Croatia at the turn of the 14th century, and ruled most of the Croatian Kingdom, Dalmatia, Bosnia, Hum and part of the Neretva Duchy. Pavao I, a Croatian ban and ‘Lord of Bosnia’, was preeminent among them. The Šubić Zrinski clan descended from the Bribir dukes and became the most powerful, richest Croatian nobles of the 16th and 17th centuries.

Croatia retained self-identity and statehood even in the personal union with Hungary, and later within the Habsburg Monarchy system, as can be seen from old maps on which the country is usually depicted as a separate political entity, including this map by the Dutch cartographer Gerard de Jode (Antwerp, 1593).

‘The bulwark of Christianity’ (1527–1683)

In the mid-15th century, the Ottomans began to press forward into the Croatian lands, particularly after Bosnia fell under their rule in 1463. Their advance was halted by King Matthias Corvinus (ruled from 1458 to 1490), who built a strong fortification system on the eastern borders of Croatia and Slavonia. However, defences were weakened after a victory by the Ottomans at the Battle of Krbava Field in 1493, in which the Croatian nobility was decimated.

‘The Bulwark of Christianity’. Antemurale christianitatis was the Latin expression used in diplomatic correspondence to describe Croatia (a letter from Pope Leo X sent in 1519 to the Croatian ban Petar Berislavić). Simultaneously, the phrase ‘remnants of the remnants’ (reliquiae reliquiarum) was also used, an abbreviation for the ‘remnants of the remnants of the once great and celebrated Kingdom of Croatia’ (reliquiae reliquiarum olim magni et inclyti regni Croatiae).

Following the death of the last Croato-Hungarian king, Louis II of Jagiellon at Mohács, the Croatian nobles elected Ferdinand I of the Habsburg dynasty as ruler in 1527. He opposed the pretender Ivan Zapolja (John Zápolya) and fought against the Ottomans.

The Battle of Sisak. The battle for the fortress of Sisak was fought between the Croato-Austrian and Ottoman armies from 15 to 22 June 1593. The victory at Sisak brought a permanent halt to the advances of the Ottomans to the west and their occupation of Croatian lands, and created military equilibrium on the border with the Ottoman Empire.
Croatia in the early 17th century
The deaths of the Croatian nobles Petar Zrinski and Fran Krsto Frankapan, the bearers of the tradition of the Croatian state and the proponents of greater independence, took place in 1671 in Wiener Neustadt near Vienna.

In order to strengthen the defences of Zagreb, the first joint Sabor (Diet) of the Croatian and Slavonian nobility was held in 1558, at which the Croatian lands were politically united.

The Ottoman occupation of Croatian lands was halted in 1593 at the Battle of Sisak, and the Habsburgs established the Military Border for defence purposes in the areas bordering the Ottoman Empire. The Military Border (Vojna krajina) was not under Croatian control until 1881.

The dissatisfaction of the Croatian nobility with the commandeering of Croatian land, the inconsistency of the Habsburgs in terms of mounting a defence against the Ottomans, and their interference in the authority of the Croatian ban and the Sabor resulted in a failed anti-Habsburg plot in 1671, led by the bans Petar Zrinski and Fran Krsto Frankapan. The Habsburgs used the opportunity of crushing the plot to introduce absolute power over Croatia and Hungary.