stylistic:style_transfer, structural:expansion
Antiquity

Greek colonies established on the Black Sea coast in the 7th century BC became important centres of commerce with the local tribes. Among the native peoples, Herodotus listed the Getae of the Lower Danube region, the Agathyrsi of Transylvania and the Syginnae of the plains along the river Tisza at the beginning of the 5th century BC. Centuries later, Strabo associated the Getae with the Dacians who dominated the lands along the southern Carpathian Mountains in the 1st century BC.

Burebista was the first Dacian ruler to unite the local tribes. He also conquered the Greek colonies in Dobruja and the neighbouring peoples as far as the Middle Danube and the Balkan Mountains between around 55 and 44 BC. After Burebista was murdered in 44 BC, his kingdom collapsed.

The Romans reached Dacia during Burebista's reign and conquered Dobruja in 46 AD. Dacia was again united under Decebalus around 85 AD. He resisted the Romans for decades, but the Roman army defeated his troops in 106 AD. Emperor Trajan transformed Banat, Oltenia, and the greater part of Transylvania into a new province called Roman Dacia, but Dacian and Sarmatian tribes continued to dominate the lands along the Roman frontiers.

The Romans pursued an organised colonisation policy, and the provincials enjoyed a long period of peace and prosperity in the 2nd century. Scholars accepting the Daco-Roman continuity theory—one of the main theories about the origin of the Romanians —say that the cohabitation of the native Dacians and the Roman colonists in Roman Dacia was the first phase of the Romanians' ethnogenesis. The Carpians, Goths, and other neighbouring tribes made regular raids against Dacia from the 210s.

The Romans could not resist, and Emperor Aurelian ordered the evacuation of the province Dacia Trajana in the 270s. Scholars supporting the continuity theory are convinced that most Latin-speaking commoners stayed behind when the army and civil administration were withdrawn. The Romans did not abandon their fortresses along the northern banks of the Lower Danube for decades, and Dobruja (known as Scythia Minor) remained an integral part of the Roman Empire until the early 7th century.