Pope vs anti pope


Does anyone know any historical information on these “anti popes” and the Catholic position on these outsiders?

#171 Adrian IV (1154-1159)

Antipope Victor IV (1159-1164)
Antipope Paschal III (1164-1168)
Antipope Calistus III (1168-1178)

#172 Alexander III (1159-1181)

#198 John XXII (1316-1334)

Antipope Nicholas V (1328-1330) (the schismatic crow)

#199 Benedict XII (1334-1342)


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