BEAUMARIS, market town, municipal borough, and county town, Anglesey, north Wales, situated at the north-east end of the Menai Strait. Population (1931) 1,708. The town is a typical small castle town. Beaumaris castle was built by Edward I. in 1293, the name being derived from the marsh ("beau marais") which was drained by the fosse. Communication with the sea by means of a canal enabled ships to discharge provisions for the garrison. The church of St. Mary is of the same period as the castle. The earliest charter was granted by Edward I. in 1283 and revised by Elizabeth. As in most towns of similar history, we find the establishment of a free grammar school in Eliza bethan times (Beaumaris 1603). The town championed the Con servative cause during the Civil War and the Jacobean revolts. As county town it became a centre for social life, and for mari time and local trade, during the 18th and 19th centuries. Since the decline of the coastal trade Beaumaris has lived on its past, although it caters to a few visitors during the summer months.