The History of the Decline and Fall of the Roman Empire - Edward Gibbon [1603]
[Footnote !: According to Nicetas, (p. 444,) Andronicus despised the imbecile Isaac too much to fear him; he was arrested by the officious zeal of Stephen, the instrument of the Emperor's cruelties. - M.]
I have been tempted to expatiate on the extraordinary character and adventures of Andronicus; but I shall here terminate the series of the Greek emperors since the time of Heraclius. The branches that sprang from the Comnenian trunk had insensibly withered; and the male line was continued only in the posterity of Andronicus himself, who, in the public confusion, usurped the sovereignty of Trebizond, so obscure in history, and so famous in romance. A private citizen of Philadelphia, Constantine Angelus, had emerged to wealth and honors, by his marriage with a daughter of the emperor Alexius. His son Andronicus is conspicuous only by his cowardice. His grandson Isaac punished and succeeded the tyrant; but he was dethroned by his own vices, and the ambition of his brother; and their discord introduced the Latins to the conquest of Constantinople, the first great period in the fall of the Eastern empire.
If we compute the number and duration of the reigns, it will be found, that a period of six hundred years is filled by sixty emperors, including in the Augustan list some female sovereigns; and deducting some usurpers who were never acknowledged in the capital, and some princes who did not live to possess their inheritance. The average proportion will allow ten years for each emperor, far below the chronological rule of Sir Isaac Newton, who, from the experience of more recent and regular monarchies, has defined about eighteen or twenty years as the term of an ordinary reign. The Byzantine empire was most tranquil and prosperous when it could acquiesce in hereditary succession; five dynasties, the Heraclian, Isaurian, Amorian, Basilian, and Comnenian families, enjoyed and transmitted the royal patrimony during their respective series of five, four, three, six, and four generations; several princes number the years of their reign with those of their infancy; and Constantine the Seventh and his two grandsons occupy the space of an entire century. But in the intervals of the Byzantine dynasties, the succession is rapid and broken, and the name of a successful candidate is speedily erased by a more fortunate competitor. Many were the paths that led to the summit of royalty: the fabric of rebellion was overthrown by the stroke of conspiracy, or undermined by the silent arts of intrigue: the favorites of the soldiers or people, of the senate or clergy, of the women and eunuchs, were alternately clothed with the purple: the means of their elevation were base, and their end was often contemptible or tragic. A being of the nature of man, endowed with the same faculties, but with a longer measure of existence, would cast down a smile of pity and contempt on the crimes and follies of human ambition, so eager, in a narrow span, to grasp at a precarious and shortlived enjoyment. It is thus that the experience of history exalts and enlarges the horizon of our intellectual view. In a composition of some days, in a perusal of some hours, six hundred years have rolled away, and the duration of a life or reign is contracted to a fleeting moment: the grave is ever beside the throne: the success of a criminal is almost instantly followed by the loss of his prize and our immortal reason survives and disdains the sixty phantoms of kings who have passed before our eyes, and faintly dwell on our remembrance. The observation that, in every age and climate, ambition has prevailed with the same commanding energy, may abate the surprise of a philosopher: but while he condemns the vanity, he may search the motive, of this universal desire to obtain and hold the sceptre of dominion. To the greater part of the Byzantine series, we cannot reasonably ascribe the love of fame and of mankind. The virtue alone of John Comnenus was beneficent and pure: the most illustrious