Normans; Benedict IX
The Normans weren't the ones to destroy the papacy in the 11th century. They could have done it some temporal damage in 1049 when they were at war with the papacy (and captured the pope in battle at Civitate), but even if Leo IX had been killed, the papacy's prestige would not have been hurt. In fact it might have been enhanced. Thereafter, the Normans and Papacy came to a modus vivendi and were on quite good terms by the end of the century.
So much so that in 1085, the Normans rescued Gregory VII from Rome when it was occupied by Henry IV's troops. Had they failed, Henry's puppet would have been installed but he would not have been accepted everywhere, and if necessary Gregory's loyalists would have elected a successor.
There might be an opportunity to wreck the papacy earlier in the century, when it had one of the most corrupt popes ever (Benedict IX). Among many other misdeeds, Benedict sold the papacy in 1045 (then tried to renege on the deal). For a while there were three rival popes.
If that state of affairs continued, with corrupt popes multiplying the office and making a mockery of it, its prestige could have been ruined. First, howver, there would have been at least one serious effort to reform; for the papacy to fall, the reformers would have to degenerate into corruption, too.
The Normans weren't the ones to destroy the papacy in the 11th century. They could have done it some temporal damage in 1049 when they were at war with the papacy (and captured the pope in battle at Civitate), but even if Leo IX had been killed, the papacy's prestige would not have been hurt. In fact it might have been enhanced. Thereafter, the Normans and Papacy came to a modus vivendi and were on quite good terms by the end of the century.
So much so that in 1085, the Normans rescued Gregory VII from Rome when it was occupied by Henry IV's troops. Had they failed, Henry's puppet would have been installed but he would not have been accepted everywhere, and if necessary Gregory's loyalists would have elected a successor.
There might be an opportunity to wreck the papacy earlier in the century, when it had one of the most corrupt popes ever (Benedict IX). Among many other misdeeds, Benedict sold the papacy in 1045 (then tried to renege on the deal). For a while there were three rival popes.
If that state of affairs continued, with corrupt popes multiplying the office and making a mockery of it, its prestige could have been ruined. First, howver, there would have been at least one serious effort to reform; for the papacy to fall, the reformers would have to degenerate into corruption, too.