Here then we have at length the explanation of a difficulty often raised. Why is "the Tower of London" so styled?[977] And although, in England, the style may now be unique, men spoke in the days of which I write of the "Tower" of Bristol or of Rochester as of the Tower of Gloucester.[978] Abroad, the form was more persistent, and special attention may be drawn to the Tower of Le Mans ("Turris Cenomannica),"[979] because the expression "regia turris" which Ordericus applies to it is precisely that which Florence of Worcester applies, in 1114, to the Tower of London, to which it bore an affinity in its relation to the Roman Wall.[980] All that I have said of the "turris" keep is applicable to the "mota" also, _mutatis mutandis_, for the _motte_, though its name was occasionally extended to the whole fortress, was essentially the actual keep, the crowned mound, as is well brought out in the passages quoted by Mr. Clark from French charters:— "Le motte _et les fossez d'entour_ ... le motte de Maiex ... le motte de mon manoir de Caieux _et les fossez d'entour_."[981] Here the "fossez d'entour" represent the surrounding works, the "castellum" referred to in the charters of the Empress. But between "the right to hold a moot there," "the moat (_sic_) and castle" as Mr. Hallam rendered it, "the moat (_sic_) probably the _motte_" of Mr. Clark (ii. 112), and the clever evasion "mote" in the _Reports on the Dignity of a Peer_ (_Third Report_, p. 163), the unfortunate "mota" of Hereford has had a singular fate. * * * * * And now for the results of those conclusions that I have here endeavoured to set forth. The three castles to which I shall apply them are those of Rochester, of Newcastle, and of Arques. In an elaborate article on the keep of Rochester, Mr. Hartshorne showed that it was erected, not as was believed by Gundulf, but by Archbishop William of Corbeuil,[982] between 1126 and 1139. But he did not attempt to explain what was the "castle of stone" which Gundulf is recorded to have there constructed. As everything turns on the exact wording, I here give the relevant portions of the document in point: — "Quomodo Willelmus Rex filius Willelmi Regis rogatu Lanfranci Archiepiscopi concessit et confirmavit Rofensi ecclesiæ S. Andreæ Apostoli ad victum Monachorum manerium nomine Hedenham; quare Gundulfus Episcopus _Castrum_ Rofense _lapideum_ totum de suo proprio Regi construxit.