Gregorio III, papa, 121, 122.
Gregorio IV, papa, 143.
Gregorio V, papa, 155.
Gregorio VI, papa, 163, 164, 175.
Gregorio VII, papa, 164, 167, 170, 175, 176, 177, 178, 179, 180, 181, 182, 183, 187, 190, 195, 208, 214, 230, 234, 279, 281; II, [21], [22], [89], [122], [177], [231].
Gregorio VIII, papa, 212.
Gregorio IX, papa, 219, 222.
Gregorio X, papa, 229, 230, 231.
Gregorio XI, papa, 252.
Gregorio XII, papa, 257, 262.