antipopes's Usage Examples:

had migrated to Rome, two antipopes, Clement VII.

and his imperial antipopes, encouraging the emperors son to rebel against him, and stirring up Europe for the first crusade.

Boniface won Naples, which had owed spiritual allegiance to the antipopes Clement VII.

as popes rather than as antipopes, and accordingly count Gregory's pontificate from 1406 to 1409.

NOVATIANUS, Roman presbyter, and one of the earliest antipopes, founder of the sect of the Novatiani or Novatians, was born about the beginning of the 3rd century.