Cross-in -circle grave marker, 875-925
Set in a niche in the west wall of Hexham Abbey
"….For the circle is perfect and infinite in its nature; but it is fixed for ever in its size; it can never be larger or smaller. But the cross though it has it at its heart a collision and a contradiction, can extend its four arms for ever without changing. The circle returns up its self and is bound. The cross opens its arms its arms to the four winds; it is a sign post for free travelers."
(G.K. Chesterton, Orthodoxy page 50)