EntityQ232896· pop 10· linked from 321 articlestwo emperor problemSign in to savea problem arising when multiple people claim the title of emperorConnectionslist of Byzantine emperorsEntityHoly Roman EmperorEntityPalaiologosEntityMiddle AgesEntityPopeEntityByzantine EmpireEntityIvan the TerribleEntityFrederick BarbarossaEntityhistoriographyEntityPapal StatesEntityTsardom of RussiaEntityEmperor Rudolf IIEntityEcumenical Patriarchate of ConstantinopleEntityvassalEntityEmpire of NicaeaEntityWar of the PacificEntityAlcuinEntityOtto IIEntityVasili III of MoscowEntitymilitary historyEntityCategories2 (number)Byzantine Empire–Carolingian Empire relationsByzantine Empire–Empire of Trebizond relationsByzantine Empire–First Bulgarian Empire relationsByzantine Empire–Holy Roman Empire relationsEastern Orthodox–Catholic conflictsFormer monarchies of EuropeHistory of diplomacyHistory of the Byzantine EmpireHistory of the Ottoman EmpireHoly Roman Empire–Ottoman Empire relations