L
- Lady of Neuville
- Laguatan
- Lalakaon, Battle of
- Laskaris
- Latin Empire
- Latin Patriarch of Constantinople
- Law, Byzantine
- Law, Roman
- Lazar of Serbia
- Lazarus Zographos
- St. Lazarus (Larnaca), Church of
- Lazic War
- Lazica
- Leo I the Thracian
- Leo, House of
- Leo I, Pope of Rome
- Leo I, Prince of Armenia
- Leo I, King of Armenia
- Leo II (emperor)
- Leo II, Pope of Rome
- Leo III the Isaurian
- Leo III, Pope of Rome
- Leo IV the Khazar
- Leo V the Armenian
- Leo VI the Wise
- Leo Choirosphaktes
- Leo Diogenes
- Leo Gabalas
- Leo of Chalcedon
- Leo Passianos
- Leo Phokas the Elder
- Leo Phokas the Younger
- Leo Rhabdouchos
- Leo Sarakenopoulos
- Leo Sgouros
- Leo Styppes, Patriarch of Constantinople
- Leo the Deacon
- Leo Tornikios
- Leon I of Abkhazia
- Leon II of Abkhazia
- Leonardo I Tocco
- Leonardo II Tocco
- Leonardo III Tocco
- Leontia (daughter of Leo I)
- Leontia
- Leontios
- Leontios of Neapolis
- Leontius (usurper)
- Leontius (writer)
- Leontius Theotokites
- Levant, History of the
- Levounion, Battle of
- Liberatus of Carthage
- Liberius (praetorian prefect)
- Licario
- Licinia Eudoxia
- Lindos
- Little Hagia Sophia
- Liutprand, King of the Lombards
- Liutprand of Cremona
- Liuvigild
- Logothete
- Logothetes ton agelon
- Logothetes ton oikeiakon
- Logothetes tou dromou
- Logothetes tou genikou
- Logothetes tou praitoriou
- Logothetes tou stratiotikou
- Lombards
- Longinus (consul 486)
- Longinus of Cardala
- Longinus of Selinus
- Longobardia
- Lordship of Negroponte
- Loros
- Louis I, Duke of Bourbon
- Louis VII of France
- Louis Bréhier
- Louis of Burgundy
- Louis, Prince of Taranto
- Loukas Notaras
- Lucania (theme)
- Lucius (consul 413)
- Luke Chrysoberges, Patriarch of Constantinople
- Luke of Steiris
- Lupus Protospatharius
- Lykandos
- Lyon, Second Council of
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