The 10th-century Penmon Cross stands nearly 2 meters tall and displays complex Celtic knotwork.
The holy well adjacent to the site is traditionally associated with Saint Seiriol and was a destination for medieval pilgrims.
The priory's monastic buildings were largely abandoned following the Dissolution of the Monasteries in the 16th century.
The church incorporates re-used Roman stone masonry in its construction.
The site overlooks the Menai Strait and Puffin Island (Ynys Seiriol), where the saint originally settled.
Priordy Seiriol Sant, also known as Penmon Priory, is an Augustinian monastic site located on the eastern tip of Anglesey. The site preserves a 12th-century church dedicated to Saint Seiriol, who established a hermitage here in the 6th century. It features a notable Romanesque chancel arch and 12th-century carvings. The complex includes the ruins of a monastic cloister and a 13th-century fish pond. A nearby 10th-century high cross features intricate interlaced carvings typical of the period. The site remains a significant location for early Christian history in North Wales.
The view of the 10th-century high cross framed against the stone walls of the priory church.
Wear sturdy, waterproof footwear as the grass around the ruins can be muddy and uneven.
Bring binoculars to observe birdlife on Puffin Island from the shoreline near the priory.
Visit the nearby Penmon Point lighthouse while in the immediate vicinity.
Do not attempt to walk across the tidal causeway to Puffin Island, as it is dangerous and prohibited.
The site is generally open year-round, but the interior of the church may be restricted during private services or events.
Respect the church as an active place of worship; remain quiet and dress modestly.
