Byzantine civil war of 1321–1328

BelligerentsAndronikos II Palaiologos
Serbian KingdomAndronikos III Palaiologos
Second Bulgarian EmpireCommanders and leadersAndronikos II Palaiologos
Syrgiannes PalaiologosAndronikos III Palaiologos
John Kantakouzenos
Theodore Synadenos
Syrgiannes PalaiologosStrength

Unknown

• Numerous Bulgarian, Serbian, and Tartar mercenaries
• Smaller number of supporters
• Population of Constantinople

Unknown

• Numerous mercenaries
• Younger nobility
• Included more supporters, including non-combatants
• Population of Thrace and Macedonia

Casualties and lossesFirst conflict (1321): unknown
Second conflict (1322): few, or light
Third conflict (1327–28): possibly heavier, but comparatively light. Unknown, but also possibly comparatively light

The Byzantine civil war of 1321–1328 was a series of conflicts between the Byzantine emperorAndronikos II Palaiologos and his grandson Andronikos III Palaiologos over control of the Byzantine Empire.