the roman legions (armies) of the governor of roman britain, lollius urbicus, built the wall for the emperor between 139 and 142. the wall was about long. its foundations were made of stone and was between and wide. the wall itself was made of turf. in front of the wall (on the northern side) was a ditch. the ditch was away from the wall. the ditch was at least deep and was nearly wide in places. the romans used the wall until after 158. the last romans went away from the wall in around 163. after that, the wall fell into ruins slowly.