https://www.vatican.va/content/vatican/en/holy-father/gelasio-ii.html
Gelasius II
ii
https://en.wikisource.org/wiki/Dictionary_of_National_Biography,_1885-1900/Gelasius
Dictionary of National Biography, 1885-1900/Gelasius - Wikisource, the free online library
https://www.vatican.va/content/vatican/en/holy-father/gelasio-i.html
Gelasius I