[Sidenote: Submission of Henry II.]
Nor was this Alexander's only triumph. So long as Archbishop Thomas Becket remained unreconciled to Henry II, the English King had done all in his power to influence Alexander. A marriage alliance was carried out between the royal families of England and Sicily, solely with the object on Henry's side of neutralising one of the chief papal supporters, and Henry scattered his bribes among the Lombard cities with the same intent. But the reconciliation to which the attitude of his own people forced Henry in 1170 robbed him of all excuse for harassing the Pope, and the murder of the Archbishop by four of the King's knights in Canterbury Cathedral isolated Henry and forced him to a humiliating treaty with Alexander.
[Sidenote: Final failure of Frederick.]
Frederick entered Italy in 1174 with small chance of success, for his army was composed of mercenaries, and many of the leading German nobles, notably his cousin Henry the Lion, refused to accompany him. He exhausted all the resources of his military art in a vain attempt to take the new fortress of Alessandria. The jealousies within the League made negotiations possible, but these broke down because Frederick refused to recognise Alessandria as a member of the League or to include Pope Alexander in any peace made with the cities. But the end was at hand. When at length the forces met at Legnano on May 29, 1176, the militia of the League won a decisive victory. All possibility of direct coercion was gone, and Frederick was forced to consider seriously a change of policy. His only chance of good terms lay in dividing his enemies. He applied to Alexander, who refused to separate his cause from that of his allies, though he allowed that the terms might be arranged in secret. This was done. Frederick undertook to recognise Alexander and to restore all the papal possessions. For the allies, peace would be made with Sicily for fifteen years; the Lombards should have a truce for six years. After much negotiation Venice was agreed upon for a general congress of all the parties to the contest, and Frederick was forced to promise that he would not enter the city without the Pope's consent. Up to the last he hoped that mutual suspicion would divide his allies. But the terms of peace were agreed upon among the allies on the bases already mentioned; then Frederick was admitted into Venice, and a dramatic reconciliation between Pope and Emperor was enacted (July 25, 1177). Frederick returned to Germany at the end of the year.
[Sidenote: Triumph of Alexander.]
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.]
Once more Frederick crossed the Alps. He had crushed his formidable cousin, Henry the Lion, and banished him from Germany; he had turned the truce with the Lombards into the Peace of Constance by acquiescing in the loss of the imperial rights for which he had fought. His eldest son, Henry, had been crowned King of Germany as long ago as 1168. Frederick was now anxious to secure for him the succession to the imperial title, and hoped to find the Pope willing to crown Henry as his father's colleague in the Empire. But although Lucius III, Alexander's successor (1181-5), had been driven from Rome, and was dependent on the Emperor's help, it was impossible for him or for any Pope to agree to Frederick's wish. Two emperors at once were a manifest absurdity, and Frederick was not likely to accept the Pope's suggestion that he should resign in favour of his son. Moreover, there lay between Pope and Emperor the still unsettled question of the inheritance of the Countess Matilda. It was clear that the quarrel must shortly be renewed. By the nature of the respective claims there could never be more than a temporary truce. Lucius died, but his successor, Urban III, was yet more irreconcilable. Meanwhile Frederick had resolved on an act which would make the breach between Papacy and Empire irreparable. The King of Sicily was William II "the Good." His marriage to a daughter of Henry II of England (1177) had proved childless, and the succession seemed likely to fall to Constance, daughter of King Roger and aunt of the reigning King. She was over thirty years of age. Frederick's defeat in 1174 had been due to his failure to divide his enemies. Now, however, he had his chance. The Lombards, having got all that they wanted, were quite favourable to him. He planned to win Sicily also by a marriage between his youthful son Henry and the almost middle-aged heiress Constance. A party in Sicily helped him; and the marriage and the coronation of the happy pair as King and Queen of Italy took place at Milan in January, 1186. Not only had the Emperor knocked away the staff upon which the Papacy had been disposed to lean its arm for more than a century; but he had actually picked it up and proposed to use it in the future for the purpose of belabouring the Popes. Moreover, he had really secured his object of a hereditary empire; for Henry, now King with his father in Germany and in Italy, must needs succeed to all the paternal honours. In vain Urban tried to raise up a party against the Emperor; and the sentence of excommunication, which at length he had determined to pronounce, was stopped only by the death of the Pope on October 20, 1187.
[Sidenote: Frederick's death.]
It was, however, chance and not the policy of the Emperor that averted the inevitable conflict. On July 5 the Christians of Palestine had suffered a crushing defeat at the battle of Hittim or Tiberias at the hand of Saladin, and on October 3 the Mohammedan conqueror entered Jerusalem. The quarrel was necessarily suspended, and a new crusade was preached with such success that in May, 1189, Frederick set out for Palestine, to be followed a year later by the Kings of France and England. But the Emperor never reached the Holy Land. He made his way by Constantinople and Iconium into Cilicia, and there not far from Tarsus he disappeared, apparently drowned while crossing or bathing in a river.