| Uprising of Ivaylo | |||||||
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| Part of the Byzantine–Bulgarian wars | |||||||
 Bulgaria in the late 13th century. The area of Ivaylo's uprising are marked with red dots. | |||||||
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| Belligerents | |||||||
 Bulgarians under Ivaylo |
Bulgarian nobility Byzantine Empire Golden Horde | ||||||
| Commanders and leaders | |||||||
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Ivaylo of Bulgaria † |
Constantine Tikh † Ivan Asen III Michael VIII Palaiologos Nogai Khan | ||||||
The Uprising of Ivaylo (Bulgarian: Въстанието на Ивайло) was a rebellion of the Bulgarian peasantry against the incompetent rule of Emperor Constantine Tikh and the Bulgarian nobility. The revolt was fuelled mainly by the failure of the central authorities to confront the Mongol menace in north-eastern Bulgaria. The Mongols had looted and ravaged the Bulgarian population for decades, especially in the region of Dobrudzha. The weakness of the state institutions was due to the accelerating feudalisation of the Second Bulgarian Empire.
The peasants' leader Ivaylo, said to have been a swineherd by the contemporary Byzantine chroniclers, proved to be a successful general and charismatic leader. In the first months of the rebellion, he defeated the Mongols and the emperor's armies, personally slaying Constantine Tikh in battle. Later, he made a triumphant entry in the capital Tarnovo, married Maria Palaiologina Kantakouzene, the emperor's widow, and forced the nobility to recognize him as emperor of Bulgaria.
The Byzantine Emperor Michael VIII Palaiologos tried to exploit this situation and intervened in Bulgaria. He sent Ivan Asen III, son of the former Emperor Mitso Asen, to claim the Bulgarian throne at the head of a large Byzantine army. Simultaneously, Michael VIII incited the Mongols to attack from the north, forcing Ivaylo to fight on two fronts. Ivaylo was defeated by the Mongols and besieged in the important fortress of Drastar. In his absence, the nobility in Tarnovo opened the gates to Ivan Asen III. However, Ivaylo broke the siege and Ivan Asen III fled back to the Byzantine Empire. Michael VIII sent two large armies, but they were both defeated by the Bulgarian rebels in the Balkan mountains.
Meanwhile, the nobility in the capital had proclaimed as emperor one of their own, the magnate George Terter I. Surrounded by enemies and with diminishing support due to the constant warfare, Ivaylo fled to the court of the Mongol warlord Nogai Khan to seek aid, but was eventually murdered. The legacy of the rebellion endured both in Bulgaria and in Byzantium. Years after the demise of the peasant emperor, two "Pseudo-Ivaylos" appeared in the Byzantine Empire and enjoyed wide support by the populace.