For 10 points, give the name for these European peoples, the namesake of a Roman province that encompassed France.
One force of these peoples, led in part by Cerethrius and Bolgios, defeated a force of Greeks under Calippus at a battle fought at Thermopylae. Another force of these people, after conquering Clusium, won the Battle of the Allia and then proceeded to be paid off with a thousand pounds of gold, though a lengthy dispute over the weight of a pound enabled (*) Marcus Furius Camillus to expel that force, under the command of their ruler Brennus, from Rome.  They were defeated in the Battle of Bibracte before winning a decisive victory at Atuatuca Tungrorum under the command of Ambiorix; those events happened in their namesake war, which also saw battles at Gergovia and Alesia that involved Vercingetorix and Julius Caesar, who wrote a commentary about that conflict.  For 10 points, give the name for these European peoples, the namesake of a Roman province that encompassed France.
One force of these peoples, led in part by Cerethrius and Bolgios, defeated a force of Greeks under Calippus at a battle fought at Thermopylae.
{Gaul}s (accept {Celt}s; accept {Pannonian}s before Clusium)