C
- Caesar (title)
- Caesarea
- Caesarea Mazaca
- Caesarius (consul 397)
- Caesaropapism
- Caesaropolis
- Calabria
- Calendar, Byzantine
- Callinicum, Battle of
- Callinicus (exarch)
- Callinicus I, Patriarch of Constantinople
- Callistus I, Patriarch of Constantinople
- Callistus II Xanthopoulos, Patriarch of Constantinople
- Calocaerus
- Calonymus
- Cannae (1018), Battle of
- Capetian House of Anjou
- Capidava
- Cappadocia
- Cappadocia (theme)
- Caria
- Carlo I Tocco
- Carlo II Tocco
- Carolingian dynasty
- Carolingian Empire
- Carthage
- Carthage (698), Battle of
- Cassian, John
- Cassiodorus
- Castle of Sant'Aniceto
- Catalan Campaign in Asia Minor
- Catalan Company
- Cataphract
- Catepanate of Italy
- Caterina Gattilusio
- Catharism
- Saint Catherine's Monastery, Mount Sinai
- Saint Catherine, Thessaloniki, Church of
- Catherine of Bulgaria
- Catherine of Courtenay
- Catherine of Valois (1303–1346)
- Cattolica di Stilo
- Caucasian Albania
- Celer (magister officiorum)
- Centurione II Zaccaria
- Cephallenia (theme)
- Chalcedon
- Chalcedon, Council of
- Chalcedon, Metropolis of
- Chaldia
- Chalke
- Chalkoprateia
- Chanaranges (Italy)
- Chariot racing
- Charito
- Chariton, Patriarch of Constantinople
- Charlemagne
- Charles I of Naples
- Charles II of Naples
- Charles III of Naples
- Charles, Count of Valois
- Charles Annibal Fabrot
- Charles Diehl
- Charles du Fresne, sieur du Cange
- Charsianon
- Chartophylax
- Chartoularios
- Chatalar Inscription
- Chelandion
- Chernomen, Treaty of
- Cherson
- Cherson (theme)
- Chilbudius
- Childebert II
- Chiliades
- Choma (fortress)
- Chonae
- Chora Monastery
- Choricius of Gaza
- Christ
- Christ Chalkites
- Christ Chalkites, Church of
- Christ Pantokrator (Nessebar), Church of
- Christianity, History of
- Christodorus
- Christopher Lekapenos
- Christophoros Burgaris
- Christoupolis
- Chronicon Paschale
- Chrysaphius
- Chrysargyron
- Chrysobull
- Chrysocheir
- Chrysopolis
- Chrysotriklinos
- Cibyrrhaeot Theme
- Civil war of 1321–1328
- Civil war of 1341–1347
- Civil war of 1352–1357
- Civil war of 1373–1379
- Cilicia
- Ciriaco de' Pizzicolli
- Clarissimus
- Clearchus (consul 384)
- Cleofa Malatesta
- Clovis I
- Clermont, Council of
- Codex Hierosolymitanus
- Codex Theodosianus
- Codex Justinianus
- Column of Justinian
- Column of Phocas
- Comentiolus
- Comentiolus (brother of Phocas)
- Comes rerum privatarum
- Comes sacrarum largitionum
- Comito
- Comnenus
- Conon, Pope of Rome
- Conrad III
- Conrad of Montferrat
- Constans
- Constans II
- Constans (consul 414)
- Constantina
- Constantina (empress)
- Constantina (Osrhoene)
- Constantine I the Great
- Constantine the Great and Christianity
- Constantine I, Patriarch of Constantinople
- Constantine I, Prince of Armenia
- Constantine II
- Constantine II, Patriarch of Constantinople
- Constantine II, Prince of Armenia
- Constantine III
- Constantine III Leichoudes, Patriarch of Constantinople
- Constantine IV
- Constantine V
- Constantine VI
- Constantine VII
- Constantine VIII
- Constantine IX Monomachos
- Constantine X Doukas
- Constantine XI Palaiologos
- Constantine, Pope of Rome
- Constantine (consul 457)
- Constantine (son of Leo V)
- Constantine Angelos Doukas
- Constantine Bodin
- Constantine Chliarenos
- Constantine Choirosphaktes
- Constantine Dalassenos (duke of Antioch)
- Constantine Dalassenos (thalassokrator)
- Constantine Diogenes
- Constantine Doukas (co-emperor)
- Constantine Doukas (died 1179)
- Constantine Doukas (usurper)
- Constantine Doukas of Thessaly
- Constantine Dragaš
- Constantine Euphorbenos Katakalon
- Constantine Gabras
- Constantine Gongyles
- Constantine Harmenopoulos
- Constantine Komnenos Doukas
- Constantine Kontomytes
- Constantine Lardys
- Constantine Laskaris
- Constantine Lekapenos
- Constantine Lips
- Constantine Makrodoukas
- Constantine Maniakes
- Constantine Meliteniotes
- Constantine Opos (catepan)
- Constantine Opos (megas doux)
- Constantine Palaiologos (half-brother of Michael VIII)
- Constantine Paparrigopoulos
- Constantine Phokas
- Constantine Stilbes
- Constantine Tikh of Bulgaria
- Constantine Tornikes
- Constantine, Forum of
- Constantinian dynasty
- Constantinople
- Constantinople, First Council
- Constantinople, Second Council
- Constantinople, Third Council
- Constantinople, Fourth Council (Roman Catholic)
- Constantinople, Fourth Council (Eastern Orthodox)
- Constantinople, Fifth Council
- Constantinople, Council of 867
- Constantinople earthquake, 557
- Constantinople, Fall of
- Constantinople (626), Siege of
- Constantinople (674–678), Siege of
- Constantinople (717–718), Siege of
- Constantinople (1203), Siege of
- Constantinople (1204), Siege of
- Constantinople (1235), Siege of
- Constantinople (1260), Siege of
- Constantinople (1422), Siege of
- Constantius II
- Constantius Gallus
- Constantiolus
- Consul
- Consularis
- Corinth
- Corpus Fontium Historiae Byzantinae
- Corpus Juris Civilis
- Cosmas Indicopleustes
- Cosmas I, Patriarch of Constantinople
- Cosmas II Atticus, Patriarch of Constantinople
- Cosmas of Maiuma
- Cosmas Vestitor
- Cotyaeum
- Cotyaeum, Battle of
- Cotyaeum, Siege of
- Count of the Stable
- Count of the Tent
- Cours (Byzantine general)
- Courtenay, House of
- Coutzes
- Covered Hippodrome
- Crete
- Crete, Byzantine
- Crete, Emirate of
- Crimea
- Crispus
- Cross-in-square
- Cross of Justin II
- Crusader invasions of Egypt
- Crusader states
- Crusades
- Cubicularius
- Cumans
- Currency, Byzantine
- Cyprus
- Cyprus (theme)
- Cyprus, History of
- Cyprus in the Middle Ages
- Cyriacus the Anchorite
- Cyriacus, Patriarch of Constantinople
- Saints Cyril and Methodius
- Cyril Mango
- Cyril of Alexandria
- Cyril of Scythopolis
- Cyrrhus, Syria
- Cyrus, Patriarch of Constantinople
- Cyrus of Alexandria
- Cyrus of Panopolis
- Cyzicus, Battle of the
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