The Byzantine emperor, Pope of Rome, and Patriarch of Constantinople often came into conflict during the Byzantine Papacy (537–752). Rival claimants to either See or the throne often buttressed their authority by the endorsement of or attempted to depose other incumbents.
Period Pope Emperor Patriarch537–552Vigilius (537–555)Justinian I (527–565)Menas (536–552)552–555Eutychius (552–565)555–561Pegalius I (556–561)561–565John III (561–574)565–574Justin II (565–578)John Scholasticus (565–577)574–577Benedict I (575–579)577–578Eutychius (577–582), restored578–579Tiberius II Constantine (578–582)579–582Pelagius II (579–590)582–590Maurice (582–602)John IV Nesteutes (582–595)590–596Gregory I (590–604)596–602Cyriacus II (596–606)602–604Phocas (602–610)604–607Sabinian (604–606)607–608Boniface III (607)Thomas I (607–610)608–610Boniface IV (608–615)610–615Heraclius (610–641)Sergius I (610–638)615–619Adeodatus I (615–618)619–625Boniface V (619–625)625–638Honorius I (625–638)638–640InterregnumPyrrhus I (638–641)640Severinus (640)640–641John IV (640–642)641Constantine III (Feb.-May 641)Heraklonas (Feb.-Sept. 641)co-ruler Constans II (641)641–642Constans II, as sole ruler (641–668)Paul II (641–653)642–649Theodore I (642–649)649–654Martin I (649–653)654–657Eugene I (654–657)Peter (654–666)657–667Vitalian (657–672)667–668Thomas II (667–669)668–669Constantine IV (668–685)Mezezius, usurper (668)co-ruler Justinian II (681–685)669–672John V (669–675)672–675Adeodatus II (672–676)675–676Constantine I (675–677)676–677Donus (676–678)677–678Theodore I (677–679)678–679Agatho (678–681)679–682George I (679–686)682–684Leo II (682–683)684–685Benedict II (684–685)685–686John V (685–686)Justinian II, as sole ruler (685–695)686–687Conon (686–687)Interregnum687–693Sergius I (687–701)Theodore (687)Paschal (687)Paul III (687–693)693–695Callinicus I (693–705)695–698Leontios (695–698)698–701Tiberios III (698–705)701–705John VI (701–705)705–708John VII (705–707)Justinian II, restored (705–711)Cyrus (705–711)708Sisinnius (708)708–711Constantine (708–715)711–712Philippikos (711–713)Interregnum712–713John VI (712–715)713–715Anastasios II (713–715)715–717Gregory II (715–731)Theodosios III (715–717)Germanus I (715–730)717–730Leo III the Isaurian (717–741)co-ruler Constantine V (720–741)730–731Anastasius (730–754)731–741Gregory III (731–741)741–752Zachary (741–752)Constantine V, as sole ruler (741–775)
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