18. The chief importance of the Church for the student of mediæval history does not lie, however, in its religious functions, vital as they were, but rather in its remarkable relations to the civil government. At first the Church and the imperial government were on a friendly footing of mutual respect and support. So long as the Roman Empire remained strong and active there was no chance for the clergy to free themselves from the control of the emperor, even if they had been disposed to do so. He made such laws for the Church as he saw fit and the clergy did not complain. The government was, indeed, indispensable to them. It undertook to root out paganism by destroying the heathen shrines and preventing heathen sacrifices, and it harshly punished those who refused to accept the teachings sanctioned by the Church. [Sidenote: The Church begins to seek independence.] But as the barbarians came in and the great Empire began to fall apart, there was a growing tendency among the churchmen in the West to resent the interference of rulers whom they no longer respected. They managed gradually to free themselves in large part from the control of the civil government. They then proceeded themselves to assume many of the duties of government, which the weak and disorderly states into which the Roman Empire fell were unable to perform properly. In 502, a church council at Rome declared a decree of Odoacer's null and void, on the ground that no layman had a right to interfere in the affairs of the Church. One of the bishops of Rome (Pope Gelasius I, d. 496) briefly stated the principle upon which the Church rested its claims, as follows: "Two powers govern the world, the priestly and the kingly. The first is indisputably the superior, for the priest is responsible to God for the conduct of even the emperors themselves." Since no one denied that the eternal interests of mankind, which devolved upon the Church, were infinitely more important than those matters of mere worldly expediency which the state regulated, it was natural for the clergy to hold that, in case of conflict, the Church and its officers, rather than the king, should have the last word. [Sidenote: The Church begins to perform the functions of government.]