
Early in the first century B.C. a Greek philosopher named Posidonius began an ambitious and dangerous journey into the little-known lands of the Celts. A man of great intellectual curiosity and considerable daring, Posidonius traveled from his home on the island of Rhodes...

There was no reason for the Greek world to be particularly concerned about the Celts in the years before and even decades after Alexander the Great. To any Greek, the Celts were just another race of distant barbarians. Traders might bring back stories of them, and occasionally...