Valentinus
827–844
Gregory IV
- Lothaire I (crowned 823)
840–855
844
John (diaconus)
844–847
Sergius II
(Louis the German, King of Germany, 840–876)
847–855
Leo IV
The mythical papess Joan or John VIII
855–858
Benedict III
855
Anastasius. - Louis II (in Italy)
855–875
858–867
Nicolas I
867–872
Adrian II
872–882
John VIII - Charles the Bald
875–881
882–884
Marinus I - Charles the Fat
881–887
884–885
Adrian III
885–891
Stephen VI - Arnulf
887–899
891–896
Formosus
Crowned emperor
896
896
Boniface VI
896–897