A tidy summary for beginners.
The Borgia family has come down through history as the epitome of Papal corruption. Research of the Borgia question has occupied historians during the intervening five centuries of Italian and religious history, and their research has produced three general propositions. First, the Borgias were certainly corrupt and dissolute. Second, they were no worse (and certainly no better) than the other "noble" families of their time. And third, what you think about the level of their corruption and notoriety depends on which contemporary sources you accept as accurate. It is also remarkable that, even after five centuries, the behavior of the Borgias can still arouse vitriolic arguments between defenders and attackers of the Papacy.
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