the name of two Roman pontiffs, the first of whom came to the papal throne in 492. He took part in the conflict then going on between the Greek and Latin Churches, but with no particular result. He also wrote some theological works, which have been partly preserved in the Bibliotheca Maxima Patrium of Lyons.

The second Gelasius became pope in 1118. After suffering many hardships and indignities from the partizans of the emperors of Germany, then at war with the popes, he fled from Rome, and finally retired to Rheims in France, where he maintained a sort of semblance of his ancient authority. He died in 1119.