Byzantine-Bulgarian Wars
Centuries of warfare between Byzantine and Bulgarian states over control of the Balkans.
Historical overview
Overview adapted from a Wikipedia summary and stored locally on May 11, 2026.
The Byzantine-Bulgarian wars were centuries of conflict over the Balkans. The balance between Constantinople and Bulgarian states repeatedly reshaped southeastern Europe.
Theater countries
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Border context
Caliphate expansion
Rashidun and Umayyad conquests rapidly transform the Levant, Egypt, Persia, North Africa and Iberia.
Former Byzantine and Sasanian territories move into Islamic imperial systems. Iberia becomes a major western frontier.Regional empires and frontier worlds
Carolingian, Byzantine, Abbasid, Tang and Viking-era conflicts shape medieval regional frontiers.
Viking expansion changes North Atlantic politics. Tang China and Abbasid power both face internal military crises.Feudal kingdoms and first crusading frontier
Medieval kingdoms, Norman expansion and the First Crusade reshape western and eastern frontiers.
The Norman conquest changes England's ruling order. Crusader states emerge in the Levant.Crusader and Mongol age
Crusades, Mongol expansion and regional state-building connect European, Middle Eastern and Asian war zones.
Mongol campaigns transform Eurasia. Crusader and Mamluk frontiers dominate the eastern Mediterranean.Late medieval dynastic wars
Dynastic, imperial and state-forming wars reshape Europe, Anatolia, Central Asia and East Asia.
The Hundred Years' War reshapes France and England. Ottoman expansion ends Byzantine rule.