The description of the Tower by the Empress, in her charter, as "turris Londonie cum parvo castello quod fuit Ravengeri," and its similar description in Stephen's charter as "turris Lond[oniæ] cum castello quod ei subest," though at first sight singular and obscure, are fraught, when explained, with interest and importance in their bearing on military architecture. It will be found, on reference to the charter granted to Aubrey de Vere (p. 180), that the Empress gives him Colchester Castle as "turrim et castellum de Colcestr[a]," a grant confirmed by her son as that of "turrim de Colcestr[a] et castellum" (p. 185 _n._), and, in later days, by Henry VIII., as "Castrum et turrim de Colcestr[a]."[943] Further, in the charter to William de Beauchamp (p. 313), we find Worcester Castle described as "castellum de Wigorn[ia] cum mota," Hereford Castle being similarly described in the charter granted at the same time to Miles de Gloucester as "motam Hereford cum toto castello." Before proceeding to the inferences to be drawn from these expressions, it may be as well to strengthen them by other parallel examples. Taking first the case of Colchester, we turn to a charter of Henry I., granted to his favourite, Eudo Dapifer, at the Christmas court of 1101,[944] in which Colchester Castle is similarly described:— "Henricus Rex Angliæ Mauricio Lond. Episcopo et Hugoni de Bochelanda et omnibus baronibus suis Anglis et Francis de Essex salutem. Sciatis me dedisse benigne et ad amorem concessisse Eudoni Dapifero meo Civitatem de Colecestrâ et _turrim et castellum_ et omnes ejusdem civitatis firmitates Cum omnibus quæ ad illam pertinent sicut pater meus et frater et ego eam melius habuimus et cum omnibus consuetudinibus illis quas pater meus et frater et ego in eâ unquam habuimus. Et hæc concessio facta fuit apud Westmonaster in primo natali post concordiam Roberti comitis fratris mei de me et de illo. "T. Rob. Ep. Lincoln et W. Gifardo Wintoniensi electo et Rob. Com. de Mellent. et Henr. Com. fr. ejus et Roger Bigoto et Gisleberti fil. Richard et Rob. fil. Baldwin et Ric. fratr. ejus."[945] Turning to Hereford, we find its description as "mota cum toto castello" recurring in the confirmation by Henry II. and the recital of that confirmation by John.[946] There is another example sufficiently important to deserve separate treatment. This is that of Gloucester. We find that, in 1137, "Milo constabularius Glocestrie" granted to the canons of "Llanthony the Second" "Tota oblatio custodum _turris et castelli_ et Baronum ibi commorantium."[947] Here again the correctness of the description is fortunately confirmed by subsequent evidence; for John recites (April 28, 1200) a charter of his father, Henry II. (which is assigned by Mr. Eyton to the spring of 1155), granting to Miles's son, Roger, Earl of Hereford,