 St Peulan 's Church , Llanbeulan is a disused medieval church in Llanbeulan , in Anglesey , north Wales . The nave , which is the oldest part of the building , dates from the 12th century , with a chancel and side chapel added in the 14th century . The church has a font of early date , possibly from the first half of the 11th century : one historian has said that it would initially have been used as an altar and that " as an altar of the pre @-@ Norman period it is a unique survivor in Wales and , indeed , in Britain " . 
