Spain and Byzantium alike remained for the most part outside the general European current. They were the buffers between Christendom and Islam. In the Spanish Peninsula the Moors were held more or less at bay, but the land was not freed from their dominion till the close of the fifteenth century. Byzantium held the Turks at bay till the middle of the same century; then she fell for ever. Between the eleventh and thirteenth centuries, Christendom carried on against Islam the long contest of the Crusades; but the warriors who took part in those wars neither fought nor organised as though themselves forming an organic body; the Christian hosts in Palestine were mere miscellaneous gatherings, united only in the temporary fits of enthusiasm. The Holy Sepulchre was gained, but within a century it was lost again; the crusading cause was one to which not states, but individuals only, devoted themselves. Conquest would have been possible only if the Crusaders had gone forth prepared to make their own homes in Asia. The East could not be held by garrisons with no abiding interest there. Islam, then, held, and more than held, its own against the West; while during these same centuries it swept east and south through the passes of the Punjab into India, establishing Turk and Afghan kingdoms over most of the great peninsula; though the vast bulk of the population there held to the Hinduism which, born of the earlier Brahmanism, had almost expelled the Buddhist religion, which, however, had established itself permanently in Further India and China. [Sidenote: Empire, Feudalism, & Papacy] The might of Islam could have been overthrown only by a united Christendom, and for that the disintegrating forces were too great. England and, more slowly, France freed themselves from feudalism. But Christendom required one head. If the Papacy had stood by the empire, feudalism might have been broken down, and the emperor have become that head. But the Papacy aimed at supremacy for itself--the spiritual power was at war with the temporal. Anti-imperial factions claimed the support of the Church; the efforts at consolidation of the great Hohenstaufen Emperors, Barbarossa and Frederick II., were unsuccessful. The empire itself became only a congeries of kingdoms and dukedoms, counties, bishoprics, free cities, and leagues of cities, under the Austrian house of Hapsburg; while Rome, mighty from the days of Gregory VII. to Innocent III., lost its prestige in the captivity at Avignon and by the Great Schism which followed. In England Wycliffe’s voice was raised; on the south-east of the empire the Hussite wars raged, premonitory of the Reformation. [Sidenote: End of the Middle Ages]