Illyro-Roman in the context of Gratianus Funarius

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.

Romanians (Romanian: români, pronounced [roˈmɨnʲ]; dated exonym Vlachs) are a Romance-speaking ethnic group and nation native to Central, Eastern, and Southeastern Europe. Romanians share a common culture, history, ancestry and language and live primarily in Romania and Moldova. There is a debate regarding the ethnic categorisation of the Moldovans, concerning whether they constitute a subgroup of the Romanians or a completely different ethnic group. The origin of the Romanians is also fiercely debated, one theory suggests that the ancestors of Romanians are the Daco-Romans, while the other theory suggests that Romanians are mainly the Thraco-Romans and Illyro-Romans from the inner balkans, who later migrated north of the Danube.

In one interpretation of the 1989 census results in Moldova, the majority of Moldovans were counted as ethnic Romanians as well. Romanians also form an ethnic minority in several nearby countries situated in Central, Southeastern, and Eastern Europe, most notably in Hungary, Serbia (including Timok), and Ukraine.

Dalmatian city-states were formerly Roman municipalities in Dalmatia where the local Romance population survived the Barbarian invasions after the fall of the Western Roman Empire in the 400s CE. Eight little cities were created by the indigenous Illyro-Roman inhabitants of the region, who maintained political links with the Eastern Roman Empire, which in return defended these cities, enabling their commercial trade with Byzantium.

The original names of these city-states were Arba, Cattarum, Crespa, Jadera, Ragusium, Spalatum, Tragurium, and Vecla. The language and the laws were initially Latin, but after a few centuries, they developed their own vulgar Latin language, Dalmatian, which survived into the 19th century. The cities were maritime centers with important commerce links, mainly with the Italian Peninsula and with the rising Republic of Venice.