As for those who in later times have engaged in the same province, we need only dip into their works to be satisfied, that to search out truth was not their business. Some are all praise and panegyric, others all satire and gall: some have made it their study to excuse the worst of Popes, others to arraign the best. That many of the Popes have been wicked men, abandonedly wicked, is undeniable, notwithstanding the pains that have been taken to extenuate their crimes; but neither are there wanting some good men among them, of innocent lives, and unblemished characters, whose only crime is their having been Popes; and to misrepresent or misconstrue the virtuous actions of these, as some have done, is no less blameable in an Historian, than to dissemble or gloss over the criminal actions of the others. This partiality may be easily accounted for with respect to one great period of the present History. During the quarrels and wars between the Popes and Emperors, which lasted many years, and occasioned, in seventy-eight battles, the destruction of an infinite number of innocent people, two powerful factions reigned, as is well known, both in _Germany_ and _Italy_, distinguished by the names of _Guelphs_ and _Ghibbelines_; the former being zealously attached to the Papal and the latter to the Imperial interest. In the midst of these distractions few writers stood neuter, but, siding, according to their different interests or inclinations, with one party or the other, drew their pens, each against the head of the party he opposed, with more rage than the soldiers did their swords. And hence it is, that we find the same facts related by contemporary authors with such different circumstances; the same persons, the Emperors especially and the Popes, painted in such different colours. Of this very few Writers in the later times have been aware; and therefore have, as their bias led them to favour one cause more than the other, adopted as undoubted truths the many groundless aspersions and undeserved reproaches which party zeal had suggested to the _Ghibbelines_ against the Popes, or to the _Guelphs_ against the Emperors. I wish I could intirely clear an eminent _Italian_ historian of our own times from this imputation.