855 CE - 857 CE: The most commonly given dates for the reign of Pope Joan.

1254 CE: Pope Innocent IV issues a decree restricting the rights of Dominicans to preach and hear confessions.

1255 CE: Dominican Jean de Mailly writes the earliest surviving account of Joan's reign as pope.

1277 CE: Martin Strebsky of Troppau adds an entry on Pope Joan to the third edition of "Chronicle of the Roman Popes and Emperors.".

1363 CE: "Concerning Famous Women" (De Mulieribus Claris) by Boccaccio is published. It describes the lives of 104 women.

1415 CE: Reformer Jan Hus was tried and condemned to death at the Council of Constance. Hus brought up the story of Pope Joan. No one present questioned that she was a real pope.

1587 CE: Florimond de Raemond debunks the story of Pope Joan in "Erreur populaire de la papesse Jane.".