I
- Iberia (Caucasus)
- Iberia, Principate of
- Iberian War
- Icon
- Iconodule
- Iconolatry
- Iconoclasm, Byzantine
- Idolatry
- Ignatius, Patriarch of Constantinople
- Ildibad
- Illus
- Illustrius Pusaeus
- Illyricum, Diocese of
- Illyricum, Praetorian prefecture of
- Immortals (Byzantine Empire)
- Indiction
- Indulf (6th century)
- Innocent III, Pope of Rome
- Ino Anastasia
- Iohannes (consul 467)
- Iohannis
- Irene Asanina
- Irene Doukaina
- Irene Gattilusio
- Irene Kantakouzene
- Irene Komnene Doukaina
- Irene Laskarina
- Irene of Athens
- Irene of Brunswick
- Irene of Hungary
- Irene of Montferrat
- Irene of Trebizond
- Irene Palaiologina (Byzantine empress)
- Irene Palaiologina, Empress of Bulgaria
- Irene Palaiologina of Trebizond
- Irene Syrikaina
- Iron Bridge, Battle of
- Isaac I Komnenos
- Isaac II Angelos
- Isaac Komnenos (brother of Alexios I)
- Isaac Komnenos (son of Alexios I)
- Isaac Komnenos (son of John II)
- Isaac Komnenos of Cyprus
- Isaac Kontostephanos
- Isaac the Armenian
- Isabella of Villehardouin
- Isaias, Patriarch of Constantinople
- Isauria
- Isaurian War
- Isbul
- Isidore of Miletus
- Isidore I, Patriarch of Constantinople
- Islam, History of
- Islamic architecture
- Italy, History of
- Ivan Alexander of Bulgaria
- Ivan Asen I of Bulgaria
- Ivan Asen II of Bulgaria
- Ivan Asen III of Bulgaria
- Ivanko of Bulgaria
- Ivan Shishman of Bulgaria
- Ivan Sratsimir of Bulgaria
- Ivan Stephen of Bulgaria
- Ivan the Russian
- Ivaylo of Bulgaria
- Iviron monastery
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