“Druids said the circle was sacred and should be left intact to preserve its mystical energies.”
their political clout is limited these days, especially as the site would have decayed in pretty short order once it went above the surface for any amount of time.
"Listen, lad. I built this kingdom up from nothing. When I started here, all there was was marsh. Other kings said I was daft to build a sacred circle on a marsh, but I built it all the same, just to show 'em. It sank into the marsh. So, I built a second one. That sank into the marsh. So, I built a third one. That burned down, fell over, then sank into the marsh, but the fourth one... stayed up! And that's what you're gonna get, lad: the strongest sacred circle in these islands."