Been looking through my husband's slides. There is a stone museum at Margam (south wales). There's about half dozen flat rectangular domed stones similar to St.Pats, not proper celtic cross, they are dated 10th C, but probably earlier. Simple cross on front face mostly, but one has a wheel depicted with 6 spokes and nothing else. Its top is cowled very similar to the early romano/native altars found in this part of Somerset. I suspect both religons lived side by side, it would have been easy enough to walk out to a stone and say a prayer to whatever god you believed in. Why are there so many single standing stones in the Welsh landscape today? scratching stone, waymarker, or symbolic references to gods that once existed from the b/a onwards. just a thought...
Moss