Anglesey (Welsh: Ynys Môn, pronounced (unniss morn), is an island and county at the northwestern end of north Wales. It is separated from the mainland by a narrow stretch of water called the Menai Strait. It is connected to the mainland by two bridges, the original Menai Suspension Bridge (carrying the A5), built by Thomas Telford in 1826 as a road link, and the newer, Britannia Bridge, carrying the A55 and the North Wales Coast Railway line. The county of Anglesey covers a number of islands apart from Anglesey itself, in particular Holy Island.

Historically, Anglesey has long been associated with Druids. In c. AD 60 the Roman general Suetonius Paullinus, determined to break the power of the druids (dreamers of the time of Boudica), attacked the island, destroying the shrine and the sacred groves. The Romans called the island Mona. After the Romans, the island was invaded by Vikings, Saxons, and Normans before falling to King Edward I of England, in the 13th century.

Môn is the Welsh name of Anglesey. The English name is a corrupted form of Old Norse, meaning the 'Isle of Ongull'. Old Welsh names are Ynys Dywyll ("Dark Isle") and Ynys y Cedairn (cedyrn or kedyrn; "Isle of brave folk"). It is the Mona of Tacitus , Pliny the Elder ) and Dio Cassius). It is called Mam Cymru ("Mother of Wales") by Giraldus Cambrensis. Clas Merddin, and Y fêl Ynys (honey isle) are other names. According to the Triads , Anglesey was once part of the mainland, as geology proves. The island was the seat of the Druids, of whom 28 cromlechs remain on uplands overlooking the sea; e.g. at Plâs Newydd. The Druids were attacked in 61 by Suetonius Paulinus, and again in 78 by Agricola. The present road from Holyhead to Llanfairpg was originally a Roman road. British and Roman camps, coins and ornaments have been dug up and discussed, especially by the Hon. Mr. Stanley of Penrhos. The foundations of Holyhead are Caer Gybi Roman.

There are numerous Megalithic monuments and Menhirs present on Anglesey testifying to the presence of man-kind from pre-history.

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