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| Penmon. Grid Ref: SH 640 812 |
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| Penmon or Trwyn Du Lighthouse |
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| Penmon Priory |
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| Penmon Priory from behind |
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| Norman arch inside priory | Altar and east window |
Wikipedia tells us that Trwyn Du Lighthouse, also known as Penmon Lighthouse, is a lighthouse between Black Point near Penmon and Ynys Seiriol, or Puffin Island, at the eastern extremity of Anglesey, marking the passage between the two islands. The first lighthouse was erected in 1838, at a price of £11,589. There had been a call for a light at this location for some years by master shipmen in the nearby city of Liverpool, especially after the steamerthe Rothsay Castle ran aground and broke up on nearby Lavan Sands in 1831 with 130 people losing their lives. The present Lighthouse, built between 1835 and 1838, is 29 metres tall and was designed by James Walker.
According to tradition, the community at Penmon grew up around a monastery established in the early 6th century by Saint Seiriol on land provided by his brother Saint Einion, king of Llŷn. Although Seiriol eventually removed himself to a hermitage on nearby Puffin Island, the monastery prospered and two crosses were set up at its gate. In 971, Vikings destroyed much of Penmon. The two crosses and the decorated font remain from this time. During the 12th century, the abbey church was rebuilt under Gruffudd ap Cynan and Owain Gwynedd. In the 13th century, under Llywelyn ap Iorwerth, monasteries started a newer more regular kind of rule, and Penmon became an Augustinian priory with conventional buildings. The priory expanded. After surviving the conquest of Wales by King Edward, it was eventually dissolved in 1538. The buildings were transferred to the ownership of the Bulkeleys of Beaumaris, a prominent local family, and are still in use today. The Bulkeleys also used most of the land for a deer park, and built the dovecot near the church.