Where: Somewhere on the Welsh bank of the river Severn  most likely at or near Magor Pill  ST43818427 The name Magor descends from Latin maceria ‘enclosure wall built of soft clay’  via Welsh magwyr and Magwr  which presumably reflects embankments put up from Roman times onwards to control the complex pattern of drainage channels that led out to a coastline probably about 800m out from the present coast