Caer Gybi was a small fortlet in the Roman province of Britannia. Its name in Latin is unknown. Today it stands at the centre of Holyhead in the Welsh county of Anglesey. Holyhead is named Caergybi in Welsh after the fort. Basic ideal plan of a Roman castrum. ... Map of the Roman Empire, with the provinces, after 120. ... Britannia on a 2005 £2 coin. ... Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ... Holyhead (Welsh: Caergybi, the fort of St. ... This article is about the country. ... Anglesey (Welsh: , pronounced (IPA)), is a predominantly Welsh-speaking island and county at the northwestern extremity of Wales. ... Welsh redirects here, and this article describes the Welsh language. ...

The fort is one of Europe's only three-walled Roman forts. The fourth side fronted the sea and probably the site of a quay. Its date is unknown, but it is generally thought to be part of a late 4th century scheme, associated with Segontium, which was set up to defend the west coast against Irish sea-raiders. The Romans also built a watch tower, within Mynydd y Twr, on the top of Holyhead Mountain which was almost certainly used as the fort's look-out point. Both were probably abandoned around 393 when the troops were probably sent to respond to the revolt of Eugenius of Gaul. In the 6th century, the old fort was given to Saint Cybi who founded a monastery there. The Church of St Cybi still stands on the site today, with a small detached chapel over Cybi's grave. This article is 150 kilobytes or more in size. ... Principal sites in Roman Britain Roman Britain refers to those parts of the island of Great Britain controlled by the Roman Empire between 43 and 410. ... A quay, pronounced key, is a wharf or bank where ships and other vessels are loaded. ... As a means of recording the passage of time, the 4th century was that century which lasted from 301 to 400. ... Segontium from the A4085 Segontium is a Roman auxiliary fort, located on the outskirts of Caernarfon in north Wales. ... Holyhead Mountain (Mynydd Tŵr in Welsh) is the highest hill on Holy Island, Anglesey, and the highest in the county of Anglesey, north Wales. ... Events Gao Zu succeeds Tai Zu as Emperor of the Later Qin Empire in China. ... This Buddhist stela from China, Northern Wei period, was built in the early 6th century. ... Monastery of St. ...

References

• Arnold, Christopher J; Davies, Jeffrey L (2000). Roman & Early Medieval Wales. Stroud: Sutton Publishing.