The Celts of Gaul (often called Gauls by Greek and Roman writers) dominated the Iron Age before the Roman conquest. Their history links the Bronze Age to Roman Gaul.
Hallstatt and La Tène
First then second Iron Age: elite tombs, trade, oppida, Celtic art.
Gallic Wars
Caesar’s campaigns (58–51 BCE); Vercingetorix and the defeat at Alesia (52). See Great Battles.