Oswestry is a town and civil parish in Shropshire, England, close to the Welsh border. It is at the junction of the A5, A483, and A495 roads. The Battle of Maserfield is thought to have been fought here in 642, between the Anglo-Saxon kings Penda and Oswald. Oswald was killed in this battle and was dismembered; according to a legend, one of his arms was carried to an ash tree by a bird, an eagle, and miracles were subsequently attributed to the tree (as Oswald was considered a saint). Thus it is believed that the name of the site derived from a reference to "Oswald's Tree". The spring Oswald's Well is supposed to have originated where the bird dropped the arm from the tree. Offa's Dyke runs nearby to the west.