Wikipedia
The Bastarnae ( Latin variants: Bastarni, or Basternae; ) were an ancient people who between 200 BC and 300 AD inhabited the region between the Carpathian mountains and the river Dnieper, to the north and east of ancient Dacia. The Peucini, denoted a branch of the Bastarnae by Greco-Roman writers, occupied the region north of the Danube delta.
The ethno-linguistic affiliation of the Bastarnae was probably Germanic, which is supported by ancient historians and modern archeology. However, some ancient literary sources imply Celtic or Scytho-Sarmatian influences. The most likely scenario is that they were originally a group of East Germanic tribes, originally resident in the lower Vistula river valley. In ca. 200 BC, these tribes then migrated, possibly accompanied by some Celtic elements, southeastwards into the North Pontic region. Some elements appear to have become assimilated, to some extent, by the surrounding Sarmatians by the 3rd century.
Although largely sedentary, some elements may have adopted a semi-nomadic lifestyle. It has not, so far, been possible to identify archaeological sites which can be conclusively attributed to the Bastarnae. The archaeological horizons most often associated by scholars with the Bastarnae are the Zarubintsy and Poienesti-Lukashevka cultures.
The Bastarnae first came into conflict with the Romans during the 1st century BC, when, in alliance with Dacians and Sarmatians, they unsuccessfully resisted Roman expansion into Moesia and Pannonia. Later, they appear to have maintained friendly relations with the Roman empire during the first two centuries AD. This changed from c. 180, when the Bastarnae are recorded as participants in an invasion of Roman territory, once again in alliance with Sarmatian and Dacian elements. In the mid-3rd century, the Bastarnae were part of a Gothic-led grand coalition of lower Danube tribes which repeatedly invaded the Balkan provinces of the Roman empire.
Large numbers of Bastarnae were resettled within the Roman empire in the late 3rd century.