Григорий V
Pope John XV, the candidate of the Roman nobles upon the death of Otto II, did not survive long enough to be deposed by Otto III, who engineered the election of Pope Gregory V upon reaching Rome in 996. However, Gregory V could not remain on the throne once Otto III headed back for Germany, and the Romans replaced him with Antipope John XVI temporarily until Otto III could return. Otto III reinstalled Gregory V and secured the election of Pope Sylvester II (999–1003) upon his death, only to die himself shortly thereafter, allowing the Roman nobles to choose three popes of their own.