How was the government system in Gaul?

[Araujo]

Thanks for those explanations, they seem quite trustable. But still there were exceptional cases, weren't there? Can someone explain me what title did Vercingetorix have at the time of the Gauls' revolt, in 52 BC? There were many tribes and still those tribes had Vergobretes and sometimes kings, and Vercingetorix made himself king. So...?