An important people of central and western Europe. Greek and Roman writers recorded them as having lived in the final centuries BC and their existence is first attested c 500 BC, but they were around long before that. They were a fierce, warrior race distinguished by three factors: their language, their beliefs, and their material culture. They are known to have invaded Italy and sacked Rome itself in the early 4th century bc, while in the following century groups of Celts invaded Greece, sacking Delphi, and others invaded Anatolia. Their language belonged to the Indo-European family and divided into two branches at an early date (2nd-3rd millennium BC), respectively represented by the Welsh and Irish Gaelic languages. Original homelands appear to have been on the western and central mainland of Europe: France, Germany, Bohemia, Austria, and Switzerland. By mid-1st millennium BC, they also lived in Iberia (Spain and Portugal), Britain, Ireland, Low Countries south of the Rhine delta, and Italy north of River Po. In Britain, they were defeated by the Romans in AD 43. Archaeologically, in central Europe there were aristocratic burials of the Hallstatt culture, often containing wagons or horses. Archaeological cultures do not necessarily coincide with ethnic or linguistic groups and it is preferable to use the cultural terms Hallstatt and La Tene when describing archaeological remains.