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Usually when speaking of Gaul, one can apply it to either a historical region, that covered and was centered in modern day France, or you can refer to the historical Gaulish people, who had inhabited this region. The concept of Gaul and the people associated with it existed within the iron age, and was conquered by rome beginning in the Gallic wars led by Julius Caesar. The political landscape of the region is still up for debate, as the Gauls did not leave written records, but it seems most likely that Gaul was dominated by a group of tribes who spoke the Gaulish language(Part of the broader Celtic language family), and that sophisticated political structures were most likely not associated with Gaul. Gaul was taken over by the Romans, and culturally assimilated into Rome, however their influence can still be seen in France and Spain, I.E. Archaeology, Language structure and some cultural practices.
I hope this was of help.