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The Romans: The Tribes of Gaul
Goldsworthy puts the situation after he explains that Gaul is essentially organized in tribes divided into clans, but you could call some of them states. The changing political and economic climate in Gaul had simply given new importance to loose ties of kinship and ritual that were very long established. Even so, he writes, the degree of unity between the clans of one tribe varied considerably and there were a number of cases during the Gallic Wars when individual clans acted independently.