Duchy of Croatia in the context of "Pannonian Avars"

The Slavs or Slavic people are a major ethnic group in Europe. They speak Slavic languages and preserve Slavic culture. There are 13 Slavic countries in Europe, which include: Poland, the Czech Republic, Slovakia, Russia, Belarus, Ukraine, Slovenia, Croatia, Bosnia and Herzegovina, Serbia, Montenegro, North Macedonia, and Bulgaria; the Slavs comprise a population of around 300 million people. There are three different Slavic ethnic groups: the West Slavs, the East Slavs, and the South Slavs; the Poles, Silesians, Kashubians, Sorbs, Czechs, and Slovaks are West Slavs; Russians, Belarusians, Ukrainians, and Rusyns are East Slavs; while Slovenes, Resians, Croats, Bosniaks, Serbs, Montenegrins, Torlakians, the Gorani, the Torbeši, Macedonians, and Bulgarians are South Slavs. Slavs are geographically distributed throughout the northern parts of Eurasia; they predominantly inhabit Central Europe, Eastern Europe, Southeastern Europe, and Northern Asia, though there is a large Slavic minority scattered across the Baltic states and Central Asia, and a substantial Slavic diaspora in the Americas, Western Europe, and Northern Europe.

Early Slavs lived during the Migration Period and the Early Middle Ages (approximately from the 5th to the 10th century AD), and came to control large parts of Central, Eastern, and Southeast Europe between the sixth and seventh centuries. Beginning in the 7th century, they were gradually Christianized. By the 12th century, they formed the core population of a number of medieval Christian states: East Slavs in the Kievan Rus', South Slavs in the Bulgarian Empire, the Principality of Serbia, the Duchy of Croatia and the Banate of Bosnia, and West Slavs in the Principality of Nitra, Great Moravia, the Duchy of Bohemia, and the Kingdom of Poland.

Croatia, officially the Republic of Croatia, is a country in Central and Southeast Europe, on the coast of the Adriatic Sea. It borders Slovenia to the northwest, Hungary to the northeast, Serbia to the east, Bosnia and Herzegovina and Montenegro to the southeast, and shares a maritime border with Italy to the west. Its capital and largest city, Zagreb, forms one of the country's primary subdivisions, with twenty counties. Other major urban centers include Split, Rijeka and Osijek. The country spans 56,594 square kilometres (21,851 square miles), and has a population of nearly 3.9 million.

The Croats arrived in modern-day Croatia, then part of Roman Illyria, in the late 6th century. In the 7th century, they organized the territory into two duchies. Croatia was first internationally recognized as independent on 7 June 879 during the reign of Duke Branimir. Tomislav became the first king by 925, elevating Croatia to the status of a kingdom. During the succession crisis after the Trpimirović dynasty ended, Croatia entered a personal union with Hungary in 1102. In 1527, faced with Ottoman conquest, the Croatian Parliament elected Ferdinand I of Austria to the Croatian throne. In October 1918, the State of Slovenes, Croats, and Serbs, independent from the Habsburg Empire, was proclaimed in Zagreb, and in December 1918, it merged into the Kingdom of Yugoslavia. Following the Axis invasion of Yugoslavia in April 1941, most of Croatia was incorporated into a Nazi-installed puppet state, the Independent State of Croatia. A resistance movement led to the creation of the Socialist Republic of Croatia, which after the war became a founding member and constituent of the Socialist Federal Republic of Yugoslavia. On 25 June 1991, Croatia declared independence, and the War of Independence was successfully fought over the next four years.

The Slavs were Christianized in waves from the 7th to 12th century, though the process of replacing old Slavic religious practices began as early as the 6th century. Generally speaking, the monarchs of the South Slavs adopted Christianity in the 9th century, the East Slavs in the 10th, and the West Slavs between the 9th and 12th century. Saints Cyril and Methodius (fl. 860–885) are attributed as "Apostles to the Slavs", having introduced the Byzantine-Slavic rite (Old Slavonic liturgy) and Glagolitic alphabet, the oldest known Slavic alphabet and basis for the Early Cyrillic alphabet.

The simultaneous missionary efforts to convert the Slavs by what would later become known as the Catholic Church of Rome and the Eastern Orthodox Church of Constantinople led to a 'second point of contention between Rome and Constantinople', especially in Bulgaria (9th–10th century). This was one of many events that preceded the East–West Schism of 1054 and led to the eventual split between the Greek East and Latin West. The Slavs thus became divided between Eastern Orthodoxy and Roman Catholicism. Closely connected to the competing missionary efforts of the Roman Church and the Byzantine Church was the spread of the Latin and Cyrillic scripts in Eastern Europe. The majority of Orthodox Slavs adopted Cyrillic, while most Catholic Slavs adopted the Latin, but there were many exceptions to this general rule. In areas where both Churches were proselytising to pagan Europeans, such as the Grand Duchy of Lithuania, the Croatian Duchy and the Principality of Serbia, mixtures of languages, scripts and alphabets emerged, and the lines between Latin Catholic (Latinitas) and Cyrillic Orthodox literacy (Slavia Orthodoxa) were blurred.

Dalmatia (/dælˈmeɪʃə, -tiə/ ; Croatian: Dalmacija [dǎlmatsija]; Italian: Dalmazia [dal'mattsja]) is a historical region located in modern-day Croatia and Montenegro, on the eastern shore of the Adriatic Sea. It is a narrow land belt stretching from the island of Rab in the north to the Bay of Kotor in the south. The Dalmatian Hinterland ranges in width from 50 kilometres in the north, to just a few kilometres in the south; it is mostly covered by the rugged Dinaric Alps. Seventy-nine islands (and about 500 islets) run parallel to the coast, the largest (in Dalmatia) being Brač, Pag, and Hvar. The largest city is Split, followed by Zadar, Šibenik, and Dubrovnik.

The name of the region stems from an Illyrian tribe called the Dalmatae, who lived in the area in classical antiquity. With the expansion of Rome, the province of Illyricum was established, and in the early 1st century it was reorganised into the province of Dalmatia, which stretched over a vast territory. Consequently, a Romance culture emerged, and the indigenous Illyrian population became romanised. Following the fall of the Western Roman Empire and the Migration Period, many different peoples passed through Dalmatia. While the local Illyro-Romans organized themselves around their city-states under Byzantine protection, the Croats arrived in the early 7th century and established the Duchy of Croatia, later becoming vassals of the Franks. With the Christianisation of the Croats, Slavic and Illyro-Roman elements began to intermingle in both language and culture. The Kingdom of Croatia was founded in 925, and it later incorporated the Theme of Dalmatia.

Branimir (Latin: Branimirus) was Duke of Croatia, reigning from 879 to c. 892. His country received papal recognition as a state from Pope John VIII on 7 June 879. During his reign, Duchy of Croatia retained its sovereignty from both Carolingian and Byzantine rule and became de jure independent. His rule marks the first real peak of early medieval Croatia. It was characterized by establishing closer relations with the Holy See, ecclestical re-organization in the former Roman province of Dalmatia, Christianization, and (re)construction of churches. Branimir is mentioned, for the period, in many reliable primary and secondary written and epigraphic sources.

The Trpimirović dynasty (Croatian: Trpimirovići) was a native Croatian dynasty that ruled in the Duchy and later the Kingdom of Croatia, with interruptions by the Domagojević dynasty from 845 until 1091. It was named after Trpimir I, the first member and founder. The most prominent rulers of the Trpimirović Dynasty include Tomislav (first king of Croatia), Petar Krešimir IV and Demetrius Zvonimir. The house gave four dukes, thirteen kings and a queen.

The culture of Croatia has historically been influenced by Central European, Mediterranean, and Balkan cultures. Croatia's unique culture and identity can be traced back to the historical llyricum. The early Croatian cultural and political identity developed through the integration of the ancient Roman heritage of Dalmatia, the traditions of early Slavic groups who settled in the region during the Migration period, and the emergence of a distinct Croatian polity by the 9th century. The Croatian language is believed to have been formed in the 6th or 7th century, with the written language present in Glagolitic texts from the 11th century.

In terms of Croatian national emancipation, the 19th-century Illyrian movement led by Ljudevit Gaj was a key driver for emergence of Croatian romantic nationalism. In 1842, the Matica ilirska organization (renamed Matica hrvatska in 1872) was established as part of the Zagreb Reading Room. The organization's mission was to promote Croatian national and cultural identity in fields of arts, science spiritual creation, economy, and public life. In 1847-1848 Croatian language replaced Latin as official language in Croatia.