In his personal life Nicholas V. (1447-55) was not unworthy of his exalted position, but the necessity of repairing the damage that had been done by the unruly assembly at Basle, which arrogated to itself the authority of an independent General Council, the removal of the last obstacle to the Turkish invasion of Europe in the fall of Constantinople, and the importance of securing for Rome a pre-eminent position in the great classical revival, engaged all his energies to the exclusion of necessary reforms. Calixtus III. (1455-58) was too old to do much, yet, notwithstanding his advancing years and the indifference of the European rulers, he threw himself into the struggle against the Turks, aiding and encouraging Hungary and Albania in their resistance, and it is due largely to his efforts that the victorious advance of Mahomet II. was checked by the overthrow of his forces at Belgrade (1456). Pius II.[1] (1458-64), though in his youth not the most exemplary of the Humanist school, devoted himself with earnestness and zeal to the duties of his sacred office. He published a Bull retracting all the attacks which he had made against the Papacy in his capacity as secretary to the /Concilabulum/ at Basle. He set himself to study the Scriptures and the early Fathers in place of the Pagan classics, and he showed his approbation of the Christian Humanists. But he was unable to undertake the work of reform. In view of the danger that still threatened Europe he convoked an assembly of the princes at Mantua to organise a crusade against the Turks, but they turned a deaf ear to his appeals, and, at last weary of their refusals and indifference, he determined to place himself at the head of the Christian forces for the defence of Europe and Christianity. He reached Ancona broken down in spirits and bodily health, and died before anything effective could be done. Paul II. (1464-71), who succeeded, made some efforts to purify the Roman Court. He suppressed promptly the College of Abbreviators who were noted for their greed for gold and their zeal for Paganism, and closed the Roman Academy. On account of his severity in dealing with the half Christian Humanists of the Curia he has been attacked with savage bitterness by Platina, one of the dismissed officials, in his /Lives of the Popes/,[2] but nobody is likely to be deceived by scurrilous libels, the motives of which are only too apparent. The worst that can be said against Paul II. is that he was too fond of appointing his relatives to high positions in the Church; but in mitigation of that it is well to remember that his reforms had raised up so many enemies against him in Rome, and disaffection was so rife amongst even the highest officials of his court, that he may have deemed it prudent to have relatives around him on whom he could rely.