The powerful Celtic social class posed a threat to the Roman Empire before being subsumed by Christianity, but their origins remain shrouded in the past. Modern Druid leader Arthur Pendragon watches ...

The Vault is Slate’s history blog. Like us on Facebook, follow us on Twitter @slatevault, and find us on Tumblr. Find out more about what this space is all about here. These maps and illustrations ...

They held no temples, left no books—but ruled minds and kings alike. The Druids were the spiritual force behind the Celts, and their secrets still echo in myth. Grassley raises alarm about soybean ...