It is remarkable that from his accession until the end of his reign these attempts fill a part of all contemporary histories quite disproportionate to what at first sight appears their importance. It is even more remarkable that during the whole period between the capture of the city by Michael and the Moslem siege in 1453 the dominant question of interest was that of the Union of the Churches. The fact that the representative of Western Europe was the sovereign pontiff accounts to a great extent, though not altogether, for the prominent part played by the religious question in nearly all the negotiations between the later emperors and the West. Not even the constant and almost unceasing struggle with the Turks occupies so much attention as do the negotiations with Rome, the embassies, the Councils, and the ever-varying tentatives to bring the two Churches into reconciliation. No true conception of the life of the empire can be formed unless it is realised how completely its citizens were occupied with these semi-religious, semi-political questions. On one side the popes were almost constant in their attempts, now to compel the Eastern Church to come in, now to persuade it; on the other, the emperors, while fully cognisant of the importance of diverting Western attacks and, at a later period, of receiving aid against the common enemy of Christendom, had constantly to meet with the dogged and unceasing opposition and bitter hostility of the great mass of their subjects to purchasing help at the price of union with the Latin Church.