Legitimate Names For Pope

One does not just pick any name upon being elected pope. The use of traditional names was well-established centuries before the Hundred Years' War. Indeed, John Paul I was the first "I" since 913. The names below are the possible names for new popes after 1337.

Adrian VI

Agapetus III

Albert II

Alexander V

Anastasius V

Benedict XIII

Boniface XI

Calixtus III

Celestine VI

Clement VI

Constantine II

Damasus III

Eugene IV

Felix V

Formosus II

Gelasius III

Gregory XI

Honorius V

Innocent VI

John XXIII

Julius II

Leo X

Lucius IV

Marcellus II

Marinus III

Martin V

Nicholas V

Pascal II

Paul IV

Pelagius III

Pius II

Romanus II

Sergius V

Sixtus VI

Stephen X

Sylvester IV

Theodore III

Urban V

Valentinus II

Victor IV

Zacharias II