the difference between the anointing of a mere layman and that of a priest". Previously, Emperors had been anointed on the head, as a priest was; this time, Adrian anointed Barbarossa between the shoulders. Further, the Pope invested him with a sword, which emphasised the Emperor's role—as Adrian saw it—as the defender of the Papacy and its privileges. Adrian, on the other hand, disallowed his chancery from addressing the Emperor by either of his preferred titles, augustus semper or semper augustus. It may be that Adrian had been frightened by the Emperor's decisive approach on Rome—Duggan notes he "impos[ed] obedience on recalcitrant cities and proclaim[ed] the resumption of Imperial rights" as he did. If so, that may have led him to over-reacting the face of a perceived slight, however small. Following the Imperial coronation, both sides appear to have taken extra care to ensure they abided by the Treaty of Constance. Barbarossa, for example, refused to entertain an embassy from the Roman commune. He did not, however, further perform as Adrian hoped, and did not defend the Papacy. Indeed, he stayed in Rome only enough time to be crowned, and then left immediately: "dubious protection" for the Pope, comments Barber. Before he left, however, his army was drawn into a bloody clash with Rome's citizens, incensed at what they saw as a display of Imperial authority in their city. Over 1,000 Romans died. The Senate continued revolting in Rome and William of Sicily remained entrenched in the Patrimony. Adrian was trapped between King and Emperor. Freed suggests that Barbarossa's failure to suppress the Roman commune for Adrian led the Pope to believe the Emperor had broken the Treaty of Constance. Further, on the Emperor's march north, his army sacked and razed the town of Spoleto. Adrian left Rome also, as his relations with the commune were still too fragile for him to be able to guarantee his safety following the Emperor's departure. As a result, the Pope was left in "virtual exile" in Viterbo, and relations between the two declined further. Normans, Greeks and Apulians Probably as a result, he responded positively to overtures from the Byzantine Emperor Manuel I, and also the native barons of Southern Italy, who saw in Adrian's support a chance for them to overthrow William, whom Adrian had recently excommunicated for invading the Papal patrimony. The rebellion had started off promisingly, with rebel victories at