A
- Aachen Cathedral
- Aaronios
- Abaskiron
- Abbasid Caliphate
- Abbasid invasion of Asia Minor (782)
- Abbasid invasion of Asia Minor (806)
- Al-Abbas ibn al-Ma'mun
- Al-Abbas ibn al-Walid
- Abd al-Aziz ibn al-Walid
- Abdallah al-Battal
- Abdallah ibn Abd al-Malik
- Abdallah ibn Qais
- Abd al-Malik ibn Marwan
- Abd al-Malik ibn Salih
- Abkhazia, Kingdom of
- Ablabius (consul 331)
- Ablabius (assassin)
- About the Mystery of the Letters
- Abu Hafs (pirate)
- Abu'l Qasim (Seljuk governor of Nicaea)
- Abu Muhammad Lulu al-Kabir
- Acacius of Amida
- Acacius, Patriarch of Constantinople
- Acacius (Alexandria)
- Acacius (curator)
- Acacius (proconsul)
- Acacius (son of Archelaus)
- Achaea (Roman province)
- Achaea, Principality of
- Acheiropoietos, Church of the
- Achelous (917), Battle of
- Achelous (1359), Battle of
- Acilisene, Peace of
- Acindynus (Carrhae)
- Acropolitissa, wife of Michael of Trebizond
- Actuarius
- Adamantius (praefectus urbi)
- Adarnase I of Iberia
- Adarnase II of Iberia
- Adarnase III of Iberia
- Adarnase IV of Iberia
- Adarnase V of Tao
- Ad Decimum, Battle of
- Adeodatus I, Pope of Rome
- Adeodatus II, Pope of Rome
- Adolius
- Adrian I, Pope of Rome
- Adrian II, Pope of Rome
- Adrianople (378), Battle of
- Adrianople (813), Siege of
- Adrianople (1205), Battle of
- Adrianople (1254), Battle of
- Adrianople (1365), Battle of
- Adrianos Komnenos
- Aedesia
- Aegean Sea
- Aegean Sea (theme)
- Aelia Eudocia
- Aelia Eudoxia
- Aelia Flaccilla
- Aetios (eunuch)
- Aetius (praetorian prefect)
- Aëtius Amidenus
- Africa, Praetorian prefecture of
- Agapetus (deacon)
- Agapius (physician)
- Agathias
- Agatho, Pope of Rome
- Agnellus, Bishop of Ravenna
- Agnes of France (Byzantine empress)
- Agnes of Montferrat
- Agnes of Durazzo
- AIMA prophecy
- Aizanoi
- Ajnadayn, Battle of
- Akakia
- Akameros
- Akolouthos
- Akritai
- Akroinon, Battle of
- Alahan Monastery
- Alan Cameron (classical scholar)
- Alans
- Albania in the Middle Ages
- Albania under the Byzantine Empire
- Albanian history, Timeline of
- Albia Dominica
- Albsuinda
- Alda of Alania
- Aldimir
- Alexander (comes)
- Alexander (discussor)
- Alexander (taxiarch)
- Alexander (supporter of Phocas)
- Alexander (Byzantine emperor)
- Alexander Kazhdan
- Alexander of Constantinople
- Alexander of Cyprus
- Alexander of Tralles
- Alexander van Millingen
- Alexander Vasiliev (historian)
- Alexiad
- Alexios I Komnenos
- Alexios I of Trebizond
- Alexios Studites, Patriarch of Constantinople
- Alexios II Komnenos
- Alexios II of Trebizond
- Alexios III Angelos
- Alexios III of Trebizond
- Alexander III, Pope of Rome
- Alexios IV Angelos
- Alexios IV of Trebizond
- Alexios V Doukas
- Alexios Angelos Philanthropenos
- Alexios Apokaukos
- Alexios Axouch
- Alexios Branas
- Alexios Doukas Philanthropenos
- Alexios Kaballarios
- Alexios Komnenos (co-emperor)
- Alexios Komnenos (son of Andronikos I)
- Alexios Laskaris Philanthropenos
- Alexios Mosele (admiral)
- Alexios Mosele (Caesar)
- Alexios Mosele (general)
- Alexios Palaiologos (despot)
- Alexios Philanthropenos
- Alexios Philes
- Alexios Raoul (protovestiarios)
- Alexios Strategopoulos
- Alexios Tzamplakon
- Alexios Xiphias
- Al-Halawiyah Madrasa
- Alexius of Rome
- Alexius Slav
- Ali ibn Yahya al-Armani
- Aligern
- Allagion
- Alp Arslan
- Alusian of Bulgaria
- Alypius of Constantinople
- Amadeus VI, Count of Savoy
- Amalafrid
- Amalasuntha
- Amalric I of Jerusalem
- Amioun, Battle of
- Ammianus Marcellinus
- Ammonius Hermiae
- Amorium
- Amorium, Sack of
- Amphilochius of Iconium
- Anastasia (wife of Constantine IV)
- Anastasia the Patrician
- Anastasian War
- Anastasius, Patriarch of Constantinople
- Anastasius, Pope of Alexandria
- Anastasius I (emperor)
- Anastasius II
- Anastasius I of Antioch
- Anastasius II of Antioch
- Anastasius (consul 517)
- Anastasius (jurist)
- Anastasius of Samaria
- Anastasius Sinaita
- Anatolia
- Anatolic Theme
- Anatolius (consul)
- Anatolius, Patriarch of Constantinople
- Anatolius (curator)
- Anatolius (Osroene)
- Anchialus (708), Battle of
- Anchialus (763), Battle of
- Andrassos, Battle of
- André Grabar
- Andreas Palaiologos
- Andrew, Duke of Calabria
- Andrew of Crete
- Andrew of Crete (martyr)
- Andronicus, Coptic Pope of Alexandria
- Andronikos I Komnenos
- Andronikos I of Trebizond
- Andronikos II Palaiologos
- Andronikos II of Trebizond
- Andronikos III Palaiologos
- Andronikos III of Trebizond
- Andronikos IV Palaiologos
- Andronikos V Palaiologos
- Andronikos Asen
- Andronikos Doukas (co-emperor)
- Andronikos Doukas (general under Leo VI)
- Andronikos Doukas (general under Romanos IV)
- Andronikos Komnenos (son of John II Komnenos)
- Andronikos Kontostephanos
- Andronikos Palaiologos (archon)
- Andronikos Palaiologos, Lord of Thessalonica
- Angeliki Laiou
- Angelos
- An Entertaining Tale of Quadrupeds
- Angilas
- Ani, Battle of
- Anicia Juliana
- Anicius Faustus Albinus Basilius
- Anicius Probus Iunior
- Ankara
- Anna, wife of Artabasdos
- Anna Dalassene
- Anna Diogenissa
- Anna Komnene
- Anna Komnene Angelina
- Anna of Hohenstaufen
- Anna of Savoy
- Anna of Trebizond
- Anna of Trebizond, Queen of Georgia
- Anna of Moscow
- Anna Palaiologina Kantakouzene
- Anna Philanthropene
- Anna Porphyrogenita
- Anna Terter of Bulgaria
- Anna Xylaloe
- Anne of Hungary (1260–1281)
- Annianus of Alexandria
- Anno Domini
- Antalya, Siege of
- Anthemius
- Anthemius (praetorian prefect)
- Anthemius of Tralles
- Anthemius Isidorus
- Anthimus (physician)
- Anthimus I, Patriarch of Constantinople
- Anthypatos
- Antioch
- Antioch earthquake, 526
- Antioch (613), Battle of
- Antioch, Principality of
- Antiochus Chuzon
- Antipope Paschal
- Antipope Theodore
- Antonina (wife of Belisarius)
- Antony I Kassymatas, Patriarch of Constantinople
- Antony II Kauleas, Patriarch of Constantinople
- Antony III Studites, Patriarch of Constantinople
- Antony IV, Patriarch of Constantinople
- Anzen, Battle of
- Aplekton
- Apocrisiarius
- Apocrisiarius, Papal
- Apokapes
- Apollinarius (governor)
- Apollinarius of Alexandria
- Apollonius (praetorian prefect)
- Apollonius (consul 460)
- Arabia (daughter of Justin II)
- Arabs
- Arabs, Byzantine wars with the
- Arabs (780–1180), Byzantine wars with the
- Araklovon Castle
- Aratius
- Arbanon, Principality of
- Arbanon, Rebellion of
- Arbazacius
- Arcadia (daughter of Arcadius)
- Arcadiopolis (970), Battle of
- Arcadiopolis (1194), Battle of
- Arcadius
- Arcadius, Column of
- Arcadius, Forum of
- Architecture, Byzantine
- Architecture of Istanbul
- Ardabur
- Ardabur (consul 427)
- Ardagast
- Areobindus Dagalaiphus Areobindus
- Argyros (Byzantine family)
- Argyrus (Catepan of Italy)
- Ariadne (empress)
- Arianism
- Arianites
- Aristaenetus
- Aristaenetus (consul 404)
- Aristocracy and bureaucracy, Byzantine
- Aristomachus (Egypt)
- Arius
- Arkadios II, Archbishop of Cyprus
- Archontopouloi
- Armatus
- Armenia
- Armenia, Byzantine
- Armenia, Roman
- Armeniac Theme
- Armouris, Song of
- Army, Byzantine
- Army, Komnenian Byzantine
- Army, Palaiologan Byzantine
- Arsaber
- Arsaces (conspirator)
- Arsacius of Tarsus
- Arsenios Autoreianos, Patriarch of Constantinople
- Arsenius the Great
- Artabanes (general)
- Artabasdos
- Arthelais
- Asad ibn al-Furat
- Asclepigenia
- Asclepiodotus (consul 423)
- Asclepiodotus (physician)
- Asclepiodotus of Alexandria
- Asclepius of Tralles
- Ascum
- Asen and Peter, Uprising of
- Ashot I of Iberia
- Ashot II of Tao
- Asia (Roman province)
- Asia, Diocese of
- Asia Minor
- Asia Minor Slavs
- Asomatianos Tzamplakon
- Aspar
- Asparukh of Bulgaria
- Asterius of Amasia
- Athalaric
- Athanasios of Emesa
- Athanasius I, Patriarch of Constantinople
- Athanasius II, Patriarch of Constantinople
- Athanasius (grandson of Theodora)
- Athanasius (praetorian prefect)
- Athinganoi
- Atik Mustafa Pasha Mosque
- Atticus, Archbishop of Constantinople
- Augusta (honorific)
- Augustaion
- Augustine of Canterbury
- Aurelianus (consul 400)
- Autokrator
- Auxentius of Bithynia
- Avars
- Averil Cameron
- Avienus (consul 501)
- Al-'Awasim
- Azaz (1030), Battle of
- Al-Aziz
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