The schism was over, the anti-Pope submitted, and Alexander's conciliatory policy opened the way for his return to Rome. The Pope signalised the close of the long schism of eighteen years by gathering in 1179 a General Council, distinguished as the Third Lateran Council, to which came nearly a thousand ecclesiastics from various parts of Christendom. The chief canon promulgated placed the papal election exclusively in the hands of the cardinals, and ordained that a two-thirds majority of the whole College should suffice for a valid election. During the rest of his reign Alexander was occupied in mediating between Henry II and his sons, and between Henry and Louis of France. He died, again an exile from Rome, on August 30, 1181. His long pontificate is one of the most eventful in papal history. He was matched against an opponent who not only aimed at reviving the imperial claims, but was himself a man of imperial character. The difficulties of the situation might have seemed overwhelming. Where Gregory VII failed Alexander succeeded. Tact, not force, was the quality required. The infinite patience and long tenacity of Alexander met their reward. The Emperor was forced to violate the solemn oath he had sworn at Wurzburg in 1165, never to acknowledge Alexander or his successors, and never to seek absolution from this oath. The Pope had successfully asserted his claim to the civil government of Rome and to many other purely temporal possessions. [Sidenote: Frederick's new move.]