He single-handedly led the Druidic Revival and fabricated a bunch of nonsense about supposed pagan rituals.
The former "Arch-Druid of Canterbury" - Rowan Williams (no relation to Ed so far as I know) - attended one of his organization's Druidic Festivals and was invested in some sort of office.
Utter silliness bearing very little relation to reality. But the tourists (and the Welsh nationalists) just eat this stuff up.