A waller was repairing a break in a boundary line where frost had lifted the stones and left the face loose. The ground there holds clay close to the surface, so the stones stay damp, even when the air is clear. A man helping him chose a large block with a clean edge and too much weight.

Caer Fawr and Caer Einion were twin settlements raised by the Cymroth people in the high country of what would become middle Wales, serving as capital for nearly three thousand years.