(and a little other ancient Europe until there's enough for its own page)
During the Iron Age, Celts lived across a wide range of lands, from the Iberian Peninsula (Spain) to Anatolia (Turkey), but the ultimate origin of the Celts is a subject of controversy.
Polybius published a history of Rome about 150 BC in which he describes the Gauls of Italy and their conflict with Rome.
"originally called Celts, live on the remotest region of Europe on the coast of an enormous tidal sea".
Posidonius described the southern Gauls about 100 BC. Though his original work is lost it was used by later writers such as Strabo. The latter, writing in the early first century AD, deals with Britain and Gaul as well as Hispania, Italy and Galatia. Caesar wrote extensively about his Gallic Wars in 58-51 BC.
Diodorus Siculus wrote about the Celts of Gaul and Britain in his first century History.
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Here are some of the Celtic groups out there. Many don't have webpages yet (if you're in one of them, contact Marsh to find out how easy, and cheap, it is to get started). As time goes on, we hope to add more of these groups form around the world.