Gregory has been the name of sixteen popes of the Catholic Church and two antipopes:Pope Gregory I, after whom the Gregorian chant is named
Pope Gregory II
Pope Gregory III
Pope Gregory IV (827–844)
Pope Gregory V (996–999)
Antipope Gregory VI (1012)
Pope Gregory VI (1045–1046)
Pope Gregory VII, after whom the Gregorian Reform is named
Antipope Gregory VIII (1118–1121)
Pope Gregory VIII (1187)
Pope Gregory IX (1227–1241)
Pope Gregory X
Pope Gregory XI (1370–1378)
Pope Gregory XII (1406–1415)
Pope Gregory XIII (1572–1585), after whom the Gregorian calendar is named
Pope Gregory XIV (1590–1591)
Pope Gregory XV (1621–1623)
Pope Gregory XVI (1831–1846)