John Davies wrote of Fox's study: "In the planning of it, there was a degree of consultation with the kings of Powys and Gwent. On the Long Mountain near Trelystan, the dyke veers to the east, leaving the fertile slopes in the hands of the Welsh; near Rhiwabon, it was designed to ensure that Cadell ap Brochwel retained possession of the Fortress of Penygadden." And, for Gwent, Offa had the dyke built "on the eastern crest of the gorge, clearly with the intention of recognizing that the River Wye and its traffic belonged to the kingdom of Gwent".
johN Davies WrOTe of fOx's sTudy: "in THE planning Of It, there was a degreE Of consultAtion with tHe kings of pOwyS and GWENt. oN ThE long mouNTAIn NEAr Trelystan, the dyke VEers to the eAsT, leAving tHe feRtilE SlOpes In thE hANDs of THE Welsh; near rHIwabon, It was dESigned TO EnsURe That caDell Ap brOchweL retaInEd PosSessiOn of tHe fortReSs oF PeNYgaddEN." and, for gwEnt, offa had The DyKe built "on ThE eAstern crest OF the goRGe, cLEarLy WiTH the inTeNtion of recognIziNg that tHe river Wye aNd itS TraFfIc BeLonGEd To the kingdoM Of GWENT".