Pope Benedict XIII is born Vincenzo Marco Orsini. A Dominican monk who continued to live as a friar even after his election, Pope Benedict XIII will be the last pope to ever hold two diocese at the same time (Rome and Benevento).
One reason why this will never happen again may be that Benedict's associates from Benevento form a tight-knit group around him, engaging in corrupt practices and generally ruining Benedict's reputation and papacy. One in particular, Niccolo Coscia, will make a great deal of money in selling church offices and taking bribes.
By all accounts, however, Benedict himself will personally be beyond reproach, though also rather naive and tactless when it comes to political affairs.