Penmon Priory:

Scope and Content

south door, showing Norman architecture. The moulded arch and tympanum are covered with a dragonesque and interlaced ornament, derived from pre-Norman work.

See: W. Bezant Lowe's Heart of Northern Wales, Vol. 2, 1927, Page 231, Fig. 122.

See also: Old Churches of Snowdonia by Hughes and North, Page 7.