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Adriatic Sea, Croatia, Dubrovnik, Holy Roman Emperor Ferdinand I, King Petar Krešimir IV of Croatia, Kingdom of Croatia, Kingdom of Hungary, Tomislav of Croatia
From the Emperor’s Desk: In my efforts to learn more about Monarchies in Eastern Europe I have become fascinated with the beautiful picturesque country of Croatia situated on the Adriatic Sea. This is it’s history as a Kingdom.
According to the work De Administrando Imperio written by 10th-century Byzantine Emperor Constantine VII, Croats arrived in the Roman province of Dalmatia in the first half of the 7th century after they defeated the Avars.
However, that claim is disputed, and competing hypotheses date the event between the late 6th-early 7th (mainstream) or the late 8th-early 9th (fringe) centuries, but recent archaeological data established that the migration and settlement of the Slavs/Croats have been in late 6th and early 7th century.
Eventually, a dukedom was formed, the Duchy of Croatia, ruled by Borna, as attested by chronicles of Einhard starting in 818. The record represents the first document of Croatian realms, vassal states of Francia (the Carolingian Empire) at the time.
The Frankish overlordship ended during the reign of Mislav two decades later. According to Constantine VII Christianisation of Croats began in the 7th century, but the claim is disputed, and generally, Christianisation is associated with the 9th century. The first native Croatian ruler recognised by the Pope was Duke Branimir, who received papal recognition from Pope John VIII on June 7, 879.
Tomislav (of unknown ancestry) was the first king of Croatia, noted as such in a letter of Pope John X in 925.

Modern picture of Dubrovnik, Croatia
Tomislav became Duke of Croatia c. 910 and was crowned king in 925, reigning until 928. During Tomislav’s rule, Croatia forged an alliance with the Byzantine Empire against Bulgaria. Croatia’s struggles with the First Bulgarian Empire eventually led to war, which culminated in the decisive Battle of the Bosnian Highlands in 926.
In the north, Croatia often clashed with the Principality of Hungary; the state retained its borders and, to some extent, expanded with the disintegrated Lower Pannonia.
The medieval Croatian kingdom reached its peak in the 11th century during the reigns of Petar Krešimir IV (1058–1074) and Dmitar Zvonimir (1075–1089). When Stjepan II died in 1091, ending the Trpimirović dynasty, Dmitar Zvonimir’s brother-in-law King Ladislaus I of Hungary claimed the Croatian crown.
King Ladislaus I occupied almost all Croatia in 1091, which marked the beginning of an expansion period for the medieval Kingdom of Hungary. At first this led to a war and later a personal union with Kingdom of Hungary in 1102 under Coloman.
King Coloman of Hungary invaded Croatia in 1097. Ladislaus I had already occupied most of the country, but Petar Svačić, the last native King of Croatia, resisted him in the Kapela Mountains. Petar Svačić died fighting against Coloman’s army in the Battle of Gvozd Mountain.

Coloman, King of Hungary and Croatia
For the next four centuries, the Kingdom of Croatia was ruled by the Sabor (parliament) and a Ban (viceroy) appointed by the king. This period saw the rise of influential nobility such as the Frankopan and Šubić families to prominence, and ultimately numerous Bans from the two families.
An increasing threat of Ottoman conquest and a struggle against the Republic of Venice for control of coastal areas ensued. The Venetians controlled most of Dalmatia by 1428, except the city-state of Dubrovnik, which became independent. Ottoman conquests led to the 1493 Battle of Krbava field and the 1526 Battle of Mohács, both ending in decisive Ottoman victories.
King Louis II of Hungary, Croatia and Bohemia (1506 – 1526) died at Mohács, and in 1527, the Croatian Parliament met in Cetin and chose Holy Roman Ferdinand I of the House of Habsburg as the new King of Croatia, under the condition that he protects Croatia against the Ottoman Empire while respecting its political rights.