It is tempting to see in this charter—unknown, it would seem, to the historians of London—a mention of the famous "communa," the "tumor plebis, timor regni," of 1191. But the term, here, is more probably employed, as in the "communa liberorum hominum" of the Assize of Arms (1181), and the "communa totius terre" of the Great Charter (1215). At the same time, there are two expressions which occur at this very epoch, and which might support the former view. One is _conjuratio_, which, as we have seen, the Continuator applies to the action of the Londoners in 1141,[362] and which Richard of Devizes similarly applies to the commune of 1191.[363] The other is _communio_, which William of Malmesbury applies to their government in the previous April, and which the keen eye of Dr. Stubbs noted as "a description of municipal unity which suggests that the communal idea was already in existence as a basis of civil organization."[364] But he failed, it would seem, to observe the passage which follows, and which speaks of "omnes barones, qui in eorum communionem jamdudum recepti fuerant." For in this allusion we recognize a distinctive practice of the "sworn commune," from that of Le Mans (1073),[365] to that of London (1191), "in quam universi regni magnates et ipsi etiam ipsius provinciæ episcopi jurare coguntur."[366] Meanwhile, what of Geoffrey de Mandeville? A tale is told of him by Dugdale, and accepted without question by Mr. Clark,[367] which, so far as I can find, must be traced to the following passage in Trivet:— "Igitur in die Nativitatis Precursoris Domini [June 24], _obsessâ turri_, fugatur imperatrix de Londoniâ. Turrim autem Galfridus de Magnavillâ potenter defendit, et egressu facto, Robertum civitatis episcopum, partis adversæ fautorem, cepit apud manerium de Fulham."[368]