Antipope John XXIII was born in 1370.
Antipope John XXIII died in 1418.
The first Pope John XXIII was an "antipope" thus his papacy was discounted.
Antipope John XVI was born in 945.
Pope John XXIII was born at Sotto il Monte, Italy
Pope John XXIII was born on November 25, 1881.
Antipope John XVI died in 1001.
Antipope Clement III was born in 1029.
Antipope Clement VII was born in 1342.
Antipope Alexander V was born in 1339.
Antipope Benedict XIII was born in 1328.
Pope John XXIII was born on November 25, 1881.
Antipope Felix V was born on 1383-09-04.