How and when the names first appeared in Italy we do not know. The first manifestation of resistance on the part of the cities to the Imperial control was given when Milan withstood Frederick Barbarossa--in defence, it may be noted, of its own right to oppress its weaker neighbours; but during the war which followed, and which was terminated by Frederick’s defeat at Legnano, the head of the Welfs, Henry the Lion, was for most of the time fighting on the Imperial side, and though he deserted Frederick at the last, he does not seem to have given any active help to the Lombard League. Yet it may well be that in his defection we have to see a stage in the transition from Welf to Guelf. It is, however, not in Lombardy, but in Tuscany, that the names of Guelf and Ghibeline, as recognised party designations, first appear. Machiavelli says--perhaps by a confusion with the Black and White factions, of whom we shall hear later--that they were first heard in Pistoia; but however this may be, they would seem to have been definitely accepted by 1215, to which year Villani assigns their introduction into Florence. We have now reached the first date, it may be said, which students of Dante will have to remember; a date which to him, and equally to the sober chronicler Villani, marked the beginning of troubles for the city which both loved as a mother, though to the greater son she was “a mother of small love.” The occasion is so important that it ought to be related in the historian’s own words:--