The following is quoted from Gregory, Donald., Country Churchyards In Wales, (2002); (2015), pp. 223-224:
“There is no churchyard in Wales where there is a longer history of burial or where there is so obvious an example of the continuity of the religious use of one particular site. … All the churches built in this place, from the earliest religious settlement in the llan to the present early nineteenth century edifice, have stood inside a Bronze Age alignment of stones. This calculated choice of sites by early Christians adds weight to the arguments of those who believe that in former times great importance was attached to the magic powers associated with circles. … the present-day churchyard wall at Ysbyty Cynfyn contains five stones that belonged to a Bronze Age circle, of which probably three are still in their original positions, the other two having at some time been moved to act as gate posts. There are no ifs or buts about Ysbyty Cynfyn, which provides an impressive example of the continuity of religious association in a burial ground.”
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The Christianising of sites seems to be common in the Powys/Shropshire borderlands too, it seems, from a recent visit. I’ve read that the dedication name of the Saint attached can be an indication of the site’s importance in former times: St Mary, or St Michael, archangel being of the highest grade, for example… there is an equivalent of a saintly ‘league table’. I shall not mention Father Ted and second class holy relics ;-)