H
- Al-Hadi
- Haemimontus
- Hagia Irene
- Hagia Sophia
- Hagia Sophia (Thessaloniki)
- Hagia Sophia Church (Sofia)
- Hagia Sophia, Trabzon
- Hagios Demetrios
- Al-Hakim bi-Amr Allah
- Hamdanid dynasty
- Hannibalianus
- Harald Hardrada
- Haram, Battle of
- Al-Harith ibn Jabalah
- Harun al-Rashid
- Hebdomon
- Hegias
- Helena (wife of Julian)
- Helena (niece of Justin II)
- Helena Lekapene
- Helena, daughter of Alypius
- Helena Kantakouzene
- Helena Dragaš
- Helena Kantakouzene, Empress of Trebizond
- Helena of Constantinople
- Helena Angelina Doukaina
- Helena Argyre
- Helene Ahrweiler
- Heliodorus (philosopher)
- Helion (magister officiorum)
- Hellas (theme)
- Henotikon
- Henri Grégoire (historian)
- Henry of Flanders
- Heraclius
- Heraclius' campaign of 622
- Heraclius (brother of Tiberius III)
- Heraclius (son of Constans II)
- Heraclius of Edessa
- Heraclius the Elder
- Heraklonas
- Heraldry, Byzantine
- Herbert Hunger
- Heresy
- Hermit
- Hermogenes (magister officiorum)
- Hermoniakos' Iliad
- Hero the Younger
- Hervé Frankopoulos
- Hestia Tapestry
- Hesychasm
- Hesychast controversy
- Hesychius of Miletus
- Hetaireia
- Hexagram (currency)
- Hexamilion wall
- Hieria
- Hieria, Council of
- Hierius (consul 427)
- Hierocles (author of Synecdemus)
- Hikanatoi
- Hilandar
- Hilarion
- Hilderic
- Himerios (admiral)
- Hippiatrica
- Hippodrome of Constantinople
- Hirami Ahmet Pasha Mosque
- Hisham ibn Abd al-Malik
- Histamenon
- Historia Augusta
- Holy Apostles (Constantinople), Church of the
- Holy Apostles (Thessaloniki), Church of the
- Holy Roman Empire
- Holy Sepulchre, Church of
- Honorius (emperor)
- Honorius I, Pope of Rome
- Hormizd (Constantinople)
- Hormizd IV
- Hosios Loukas
- Hrach Bartikyan
- Hranislav
- Hugh I, Count of Vermandois
- Hugh of Champlitte
- Hugo Etherianis
- Huneric
- Hyelion and Leimocheir, Battle of
- Hypatia
- Hypatius
- Hypatos
- Hyperpyron
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