 Complete the following phrase:  The eastern terminus of the early medieval linear earthwork Nico Ditch is in Ashton Moss ; it was probably used as an administrative boundary and dates from the 8th or 9th century. Legend claims it was built in a single night in 869 or 870 as a defence against Viking invaders. Further evidence of Dark Age activity in the area comes from the towns name. The Ashton part probably derives from the Anglo-Saxon meaning settlement by ash trees; the origin of the under-Lyne element is less clear: it could derive from the British lemo meaning elm, or refer to Ashton being under the line of the Pennines. This means that Ashton probably became a settlement some time after the 