Emperor of the Holy Roman Empire

Definition and stakes

James Bryce Encyclopædia Britannica, Ninth Edition…

According to mediæval theory, there was and could be only one emperor in the world, the direct vicegerent of God, who represented the unity of mankind and of the Christian people on its temporal side as the pope did on its Spiritual. Hence during those ages the Western monarch and Western writers did not admit in principle, though they sometimes recognized in fact, the title of the emperor who reigned at Constantinople; and the Easterns in like manner denied the existence of an emperor in the West, and maintained that the heads of the Holy Roman Empire were merely German intruders.
Source: Wikisource

John Lord The Old Roman World : the Grandeur and Failure of Its Civilization

Civil wars create an imperator, who, uniting in himself all the great offices of state, and sustained by the conquering legions, rules from East to West and from North to South, with absolute and undivided sovereignty. The Caesars reach the summit of human greatness and power, and the city of Romulus becomes the haughty mistress of the world. The emperor is worshiped as a deity, and the proud metropolis calls herself eternal. An empire is established by force of arms and by a uniform policy, such as this world has not seen before or since.
Source: Gutenberg

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