At that time, Marinus I and Marinus II were mistakenly considered to be Martin II and Martin III respectively, and so, erroneously, Simon de Brion became Pope Martin IV.
Pada waktu itu, Marinus I dan Marinus II secara salah disangka Martinus II dan Martinus III, jadi, secara salah, Simon de Brion menjadi Paus Martinus IV.