The church was formerly a chapel of ease to Llanbeulan church, which stands 1½ miles to the N. St Mary's has a small medieval nave, but with later door and windows; chancel rebuilt in the 16thc and a S chapel added in the 17thc. The 12thc font was the only Romanesque carving when the church was visited, but it was moved to Llanfaelog church in the following year when Talyllyn was made redundant. Since it was recorded and photographed before that date it appears in the Talyllyn entry here.
To S of W entrance, a small rectangular bowl of pink-streaked gritstone decorated on two sides. On S nested chevrons, on N a cross in relief, with flaring arms and half another, of which the E arm is not flared. There is a groove along the W rim. The basin is 0.15m deep, there is no drainage hole.
|E face height||0.24m|
|E face width at bottom||0.36m|
|E face width at top||0.39m|
|N face height||0.24 - 0.265m|
|N face width at bottom||0.36m|
|N face width at top||0.415m|
|S face height||0.24m|
|S face width at bottom||0.41m|
|S face width at top||0.42m|
|Thickness of rim||0.05 - 0.065m|
|W face height||0.24m|
|W face width||0.36m|
R. Haslam, J. Orbach and A. Voelcker, The Buildings of Wales. Gwynedd, New Haven and London, 2009, 162, 221-22.
RCAHMW, An Inventory of the Ancient Monuments in Anglesey. London (HMSO) 1960, 41, pl 59.