This motte is believed to be Adulterine,that is,it was built without Royal assent.It was ,therefore,probably built during the Anarchy.No trace of a bailey has been found.Note,the difference in ground level,between,the rhs end of motte slope and the normal ground level by the fence.Excavations have shown,that the original ditch was at least another 2 metres deeper,than the present shallow ditch.
see http://www.ecastles.co.uk/philipdavis/English%20sites/1134.html
see http://www.pastscape.org.uk/hob.aspx?hob_id=376316&sort=4&search=all&criteria=great easton motte&rational=q&recordsperpage=10
see http://www.castlefacts.info/castledetails/castleDetails3.aspx?uin=11134