Up to the era of A.D. 800 there had been at Constantinople a legitimate historical prolongation of the Roman Empire. Technically, as we have seen, the election of Charles, after the deposition of Constantine VI, was itself a prolongation, and maintained the old rights and forms in their integrity. But the Pope, though he knew it not, did far more than effect a change of dynasty when he rejected Irene and crowned the barbarian chief. Restorations are always delusive. As well might one hope to stop the earth's course in her orbit as to arrest that ceaseless change and movement in human affairs which forbids an old institution, suddenly transplanted into a new order of things, from filling its ancient place and serving its former ends. The dictatorship at Rome in the second Punic war was not more unlike the dictatorships of Sulla and Cæsar, nor the States-general of Louis XIII to the assembly which his unhappy descendant convoked in 1789, than was the imperial office of Theodosius to that of Charles the Frank; and the seal, ascribed to A.D. 800, which bears the legend 'Renovatio Romani Imperii[118],' expresses, more justly perhaps than was intended by its author, a second birth of the Roman Empire. It is not, however, from Carolingian times that a proper view of this new creation can be formed. That period was one of transition, of fluctuation and uncertainty, in which the office, passing from one dynasty and country to another, had not time to acquire a settled character and claims, and was without the power that would have enabled it to support them. From the coronation of Otto the Great a new period begins, in which the ideas that have been described as floating in men's minds took clearer shape, and attached to the imperial title a body of definite rights and definite duties. It is this new phase, the Holy Empire, that we have now to consider. [Sidenote: Position and functions of the Emperor.] [Sidenote: Correspondence and harmony of the spiritual and temporal powers.]