Anglesey

Anglesey Island county of north-west Wales, separated from the mainland by the Menai Straits. In 1974 it became the district of Ynys Môn in the county of Gwynedd, but was reconstituted as a county in 1996. Its location, together with the protective barrier of the Snowdonian mountains, made it a traditional centre of resistance toinvaders, Roman and Norman. But afterconquest by Edward I it was created a county of the principality of Wales in 1284, a status confirmed at the Act of Union of 1536.

A Dictionary of British History. Ed. John Cannon. Oxford University Press, 2001.