Saint Jerome, who had spent time both in Trèves and Ancyra, says that the Treveri and the Galatians have the same language. He says this in his commentary on St Paul’s Letter to the Galatians (Migne xxvii 382). The history of these Celts who came into Asia Minor to plunder and to settle is turbulent. They seem to have been acted upon by others rather than to have been initiators in the drama of their history. Their effects, however, on the lives of their neighbours were sometimes drastic. They deserve to be considered separately from their kinsmen who invaded Greece. They made a nation. The invaders of Greece made nothing so lasting.
In 278 BC, large numbers of Celts crossed into Asia Minor at the invitation of Nicomedes of Bithynia (278-250 BC). Three tribes were involved: the Tolistobogii, the Tectosages and the Trocmi. They were more than a mercenary horde. They brought their wives and children with them. They were a people in movement. Only half their number were fighting men, and they were led by Leonorius and Lutarius. In the long term, they would tend to settle rather than raid. Their immediate employment was as mercenaries. Eventually they would pursue the old Celtic practice of mutual raiding and warfare between their tribal and cantonal districts. They had separated from Brennus’ forces before the invasion of Greece. Of the survivors of Brennus’ expedition, the Scordisci founded Singidunum in Yugoslavia; others made their way to Thrace and founded Tylis. In this region they came into contact with the culture of the Scythians. It was said of this part of the Scordisci that they did not mine gold, but preferred to steal it (Pos. Fr. 48 Jac.; Ath. 233d-234c) and for many years they extracted tributes from Byzantium.