It's worth noting that in vanilla RTW you can recruit mercenary barbarian cavalry and warbands in Galatia. This is historically correct. A large force of Celts crossed into Asia Minor from the Balkans in 278 BC, making such a nuisance of themselves that the Seleucid Empire was forced to take action. The Celts were defeated at Pergamum in 275 and settled in the Anatolian interior, which became known as Galatia. They remained there, effectively independent, until finally being absorbed by the Roman Empire in 25 BC.
ok, thanks, i was sure that it had a historical grounding.

RTR team, i salute you