The third of Gibbon's divisions of his great history was devoted to that period which is comprised between the establishment of the Holy Roman Empire in 800 and the final extinction of the Eastern Empire with the conquest of Constantinople by Mahomet II. in 1453. Although this was the longest period, Gibbon devoted much less space to it than to the preceding parts of his history. This fact was partly due to the gradual diminution of Roman interests, for the dominions of the empire became contracted to the limits of a single city, and also to the fact that the material which the most painstaking search placed at his disposal was distinctly limited. But though the conquest of the Normans, to instance one section, has been dealt with inadequately in the light of modern research, the wonderful panorama that Gibbon's genius was able to present never fails in its effect or general accuracy. The Holy Roman Empire is, of course, properly classified under Mediæval History, which accounts for its separation from the rest of Gibbon's work. _I.--Birth and Sway of the Empire_ The Western Empire, or Holy Roman Empire, as it has been called, which was re-established by Charlemagne (and lasted in shadow until the abdication of Francis II. under the pressure of Napoleon in 1806), was not unworthy of its title. The personal and political importance of Charlemagne was magnified by the distress and division of the rest of Europe. The Greek emperor was addressed by him as brother instead of father; and as long as the imperial dignity of the West was usurped by a hero, the Greeks respectfully saluted the _august_ Charlemagne with the acclamations of "Basileus" and "Emperor of the Romans." Lewis the Pious (814-840) possessed the virtue of his father but not the power. When both power and virtue were extinct, the Greeks despoiled Lewis II. of his hereditary title, and with the barbarous appellation of _Rex_ degraded him amongst the crowd of Latin princes. The imperial title of the West remained in the family of Charlemagne until the deposition of Charles the Fat in 884. His insanity dissolved the empire into factions, and it was not until Otho, King of Germany, laid claim to the title, with fire and sword, that the western empire was restored (962). His conquest of Italy and delivery of the pope for ever fixed the imperial crown in the name and nation of Germany. From that memorable era two maxims of public jurisprudence were introduced by force and ratified by time: (1) That the prince who was elected in the German Diet acquired from that instant the subject kingdoms of Italy and Rome; (2) but that he might not legally assume the titles of Emperor and Augustus till he had received the crown from the hands of the Roman pontiff.