To reassert his power Edward ordered the Hundred Rolls survey, conducted by the General Eyres, Inability to provide proof of ownership meant Barons lost their land, Hundred Rolls showed the mess the English legal system was in, so Edward set out to reform this (The English Justinian), The Statutes of Westminster turned land law from one of many mesne lords, to a system of substitution, where by selling land / passing land on meant you had no further claim to it, thereby no new mesne lords would be created. The King's feudal control remained intact at the top of the hierarchy, Barons still need the King's permission to grant land, The Church was a land loop hole, as mesne lords would gift their land to the Church, via Frankalmoign, in order to rent it back, thereby avoiding paying tax, or providing military service to Edward. The Church was a more lenient land lord!, Edward used the two Mortmain statutes to try and prevent this happening, along with Quia Emptores (3rd Westminster Statute)