Why the ancient Romans destroyed the druids?

We know very little about the mysterious druids, the ancient Celtic priests. Mostly, this information comes from the writings of ancient and Roman authors and a few archaeological finds. The Greek traveler Pytheas, who lived in the 4th century BC, was the first to write about the druids. He sailed around Europe by ship, past Britain to the very coast of the Baltic Sea. Unfortunately, among the ancient Greek authors, from Pytheas to Diogenes Laertius, who lived in the 3rd century AD, the druids are only mentioned among other priests of barbarian peoples. More detailed information…