Polybius and Diodorus are our best guides in seeking for information about the manners of the Gauls, for in the time of Caesar they had already become changed.

Polybius, the historian, Panaetius, the philosopher, Terence and Lucilius, the poets, and the orator and politician Laelius were his friends.

Among this unworthy crew a certain Polybius was not the least conspicuous.