The Byzantine civil war of 1341–1347, sometimes referred to as the Second Palaiologan Civil War, was a conflict that broke out in the Byzantine Empire after the death of Andronikos III Palaiologos over the guardianship of his nine-year-old son and heir, John V Palaiologos. It pitted on the one hand Andronikos III's chief minister, John VI Kantakouzenos, and on the other a regency headed by the Empress-Dowager Anna of Savoy, the Patriarch of Constantinople John XIV Kalekas, and the megas doux Alexios Apokaukos. The war polarized Byzantine society along class lines, with the aristocracy backing Kantakouzenos and the lower and middle classes supporting the regency. To a lesser extent, the conflict acquired religious overtones; Byzantium was embroiled in the Hesychast controversy, and adherence to the mystical doctrine of Hesychasm was often equated with support for Kantakouzenos.
As the chief aide and closest friend of Emperor Andronikos III, Kantakouzenos became regent for the underage John V upon Andronikos's death in June 1341. While Kantakouzenos was absent from Constantinople in September the same year, a coup d'état led by Alexios Apokaukos and the Patriarch John XIV secured the support of Empress Anna and established a new regency. In response, Kantakouzenos' army and supporters proclaimed him co-emperor in October, cementing the rift between himself and the new regency. The split immediately escalated into armed conflict.
During the first years of the war, forces of the regency prevailed. In the wake of several anti-aristocratic uprisings, most notably that of the Zealots in Thessalonica, a majority of the cities in Thrace and Macedonia came under regency control. With assistance from Stefan Dušan of Serbia and Umur Beg of Aydin, Kantakouzenos successfully reversed these gains. By 1345, despite Dušan's defection to the opposition and the withdrawal of Umur, Kantakouzenos retained the upper hand through the assistance of Orhan, ruler of the Ottoman beylik. The June 1345 murder of megas doux Apokaukos, the regency's chief administrator, dealt the regency a severe blow. Formally crowned as emperor in Adrianople in 1346, Kantakouzenos entered Constantinople on 3 February 1347. By agreement, he was to rule for ten years as the senior emperor and regent for John V, until the boy came of age and ruled alongside him. Despite this apparent victory, subsequent resumption of the civil war forced John VI Kantakouzenos to abdicate and retire to become a monk in 1354.
The consequences of the prolonged conflict proved disastrous for the Empire, which had regained a measure of stability under Andronikos III. Seven years of warfare, the presence of marauding armies, social turmoil, and the advent of the Black Death devastated Byzantium and reduced it to a rump state. The conflict also allowed Dušan to conquer Albania, Epirus and most of Macedonia, where he established the Serbian Empire. The Bulgarian Empire also acquired territory north of the Evros river.
Background
In 1341, the Byzantine Empire was in a state of turmoil, and despite the restoration of the Empire's capital to Constantinople and the recovery of a measure of its former power by Michael VIII Palaiologos (r. 1259–1282), the policies implemented during his reign had exhausted the state's resources, and the Empire's strength waned under his successor, Andronikos II Palaiologos (r. 1282–1328). During Andronikos' long reign, the remaining Byzantine possessions in Asia Minor slowly fell to the advancing Turks, most notably the newly established Ottoman emirate. This caused a flood of refugees into Byzantium's European provinces, while at the same time, the Catalan Company wrought havoc in the imperial domains. Taxes also rose dramatically to finance tributes to the Empire's enemies. A combination of these failures and personal ambition moved the Emperor's grandson and heir, the young Andronikos III Palaiologos, to revolt. Supported by a group of young aristocrats led by John Kantakouzenos and Syrgiannes Palaiologos, Andronikos III deposed his grandfather after a series of conflicts during the 1320s. Although successful in removing the old Emperor from power, the war did not augur well for the future, as the Empire's neighbours—the Serbs, Bulgarians, Turks, Genoese and Venetians—took advantage of Byzantine infighting to gain territory or expand their influence within the Empire.
The only son of a former governor of the Byzantine holdings in the Morea, John Kantakouzenos was related to the Palaiologoi through his mother. He inherited vast estates in Macedonia, Thrace and Thessaly, and became a childhood friend and the closest and most trusted advisor of Andronikos III. During Andronikos III's reign (1328–1341), John Kantakouzenos acted as his chief minister, holding the office of megas domestikos, commander-in-chief of the Byzantine army. The relationship between the two remained close, and in 1330, when the heirless Andronikos III (John V was born in 1332) fell ill he insisted that Kantakouzenos be proclaimed Emperor or regent after his death. Their ties were further strengthened in the spring of 1341, when the latter's eldest son, Matthew Kantakouzenos, wed Irene Palaiologina, a cousin of the Emperor.
Unlike Andronikos II, who had disbanded the Byzantine army and navy, and who favoured monks and intellectuals, Andronikos III was an energetic ruler who personally led his forces in military campaigns. In 1329, his first campaign against the Ottomans resulted in a disastrous defeat at the Battle of Pelekanos, after which the Byzantine position in Bithynia rapidly collapsed. Subsequent sorties into the Balkans were nevertheless successful in shoring up Andronikos' tottering realm. Thessaly and the Despotate of Epirus, two territories separated from the Empire after the Fourth Crusade, were restored to imperial rule, almost without bloodshed in 1328 and 1337 respectively. Andronikos III also rebuilt a modest fleet, which allowed him to recover the rich and strategically placed island of Chios from the Genoese Zaccaria family in 1329 as well as to claim the allegiance of Andreolo Cattaneo, the Genoese governor of Phocaea on the Anatolian mainland. In 1335, however, Andreolo's son Domenico captured the island of Lesbos with Genoese assistance. The Emperor led a fleet to recover it and Phocaea, and requested the aid of the Turkish emirs of Saruhan and Aydin. Saruhan sent troops and supplies, but Aydin's ruler Umur Beg came to meet the Emperor in person. It was during this encounter that Kantakouzenos and Umur established a long-lasting close friendship and alliance.
A war with Serbia in 1331–1334 proved less successful for the Emperor when several towns in Macedonia were captured by the Serbs, led by the renegade Syrgiannes Palaiologos. These gains were only curtailed when the assassination of Syrgiannes and the threat of a Hungarian invasion forced the Serbian ruler, Stefan Dušan, to seek a negotiated settlement. The subsequent peace treaty concluded between Andronikos III and Dušan was important for the future of Byzantine-Serbian relations. For the first time, the Byzantines recognized the extensive gains the Serbs had made at the Empire's expense in the central Balkans during Andronikos II's reign. In the aftermath of the pact, Dušan also moved his seat, and with it his realm's centre of gravity, south to Prilep.
Although the loss of Asia Minor proved irreversible, successes in Epirus and Thessaly led to a consolidation of the Empire in the Greek-speaking lands of the southern Balkans. Andronikos III and Kantakouzenos planned further campaigns to recover the Latin principalities of southern Greece, a project of major long-term importance, for, as the historian Donald Nicol writes, "if the whole peninsula of Greece could be united under Byzantine government then the Empire would once again be a homogeneous structure, able to stand up to the Serbians, the Italians and its other enemies. It would be small, but it would be a compact and manageable economic and administrative unit running from Cape Matapan to Thessalonica and Constantinople".
Kantakouzenos' regency: June–September 1341
Following a short illness, on the night of 14–15 June 1341 the emperor Andronikos III died at the relatively early age of 44, possibly due to chronic malaria. His nine-year-old son John (John V) was the obvious successor, but he had not been officially proclaimed or crowned as co-emperor. This left a legal vacuum, and raised the question of who would lead the Empire's government.
According to Byzantine custom, the empress-dowager automatically headed any regency. Nevertheless, despite the lack of any formal appointment, Kantakouzenos placed Andronikos III's sons and the Empress-dowager Anna of Savoy under armed guard in the palace, and in a meeting of the Byzantine Senate claimed for himself the regency and governance of the state by virtue of his close association with the deceased Emperor. He also demanded that John V marry forthwith his own daughter Helena Kantakouzene. This claim was disputed by Patriarch John XIV of Constantinople, who presented a document from Andronikos dating from 1334, assigning to him the care of the imperial family in the case of his death. Only after a demonstration of the capital's troops on 20 June did Kantakouzenos secure recognition as regent and control of the reins of government, as well as maintaining control over the army as its megas domestikos.
Nevertheless, opposition to Kantakouzenos began to coalesce around three figures: the Patriarch, a forceful man determined to have a voice in the governance of the Empire, the Empress-regent, who feared that Kantakouzenos would dispossess her son, and last but not least Alexios Apokaukos, the ambitious megas doux (commander-in-chief of the navy) and head of the bureaucracy. A 'new man' promoted to high office as the protégé of Andronikos III and possibly the richest man in the Empire by 1341, Apokaukos was distrusted by the hereditary aristocracy. The only surviving narrative accounts of the period, Kantakouzenos's memoirs and the history of Nikephoros Gregoras, with their pro-aristocracy bias, paint a very negative picture of the man. According to Kantakouzenos, Apokaukos' adherence to the Patriarch's camp resulted from his ambition: Apokaukos sought further advancement by trying to convince Kantakouzenos to declare himself Emperor. When the latter refused, Apokaukos secretly switched his allegiance.
In Donald Nicol's opinion, had Kantakouzenos remained at Constantinople, his authority might have remained secure. As the megas domestikos and regent however, he had the duty of dealing with the Empire's various enemies, who sought to take advantage of Andronikos' death. Dušan had invaded Macedonia, the Emir of Saruhan raided the coasts of Thrace, and Tsar Ivan Alexander of Bulgaria threatened war. In July Kantakouzenos left the capital at the head of the army, leaving control of the government to Apokaukos, whom he still believed loyal to him. Kantakouzenos' campaign proved successful. He persuaded Dušan to withdraw and repulsed the Turkish raiders, while Ivan Alexander, threatened by a fleet from the Emirate of Aydin, renewed his peace treaty with Byzantium. To crown this success, Kantakouzenos received an embassy of the Latin barons of the Principality of Achaea in the Morea. They expressed readiness to surrender the country in exchange for a guarantee of their property and rights. It was a unique opportunity, as Kantakouzenos himself recognized in his memoirs, since if successful, the Catalan-controlled Duchy of Athens was bound to follow, consolidating Byzantine control over Greece.
At this point Kantakouzenos received grave news from Constantinople. In late August Apokaukos attempted a coup and tried to kidnap John V. Having failed, he fled to his fortified house at Epibatai, where he was blockaded by troops. Kantakouzenos returned to Constantinople in early September, where he stayed for a few weeks consulting with the Empress. On his way back to Thrace to prepare for a campaign into the Morea, he went to Epibatai, where he pardoned Apokaukos and restored him to his former offices.
Outbreak of the war: Autumn 1341
Kantakouzenos' second departure proved a great error. Back in the capital, his enemies moved in his absence. Apokaukos gathered a group of high-ranking aristocrats around him, including men such as the megas droungarios John Gabalas or George Choumnos, whom he tied to himself by marriage alliances. The Patriarch, backed by Apokaukos' group and the authority of the Empress, dismissed Kantakouzenos from his offices and declared him a public enemy. Kalekas himself was proclaimed regent and Apokaukos named Eparch of Constantinople. Kantakouzenos' relatives and supporters were imprisoned or forced to flee the city, and their properties confiscated. Although Kantakouzenos' wife and children were safe in his headquarters at Demotika (Didymoteicho), the regency placed his mother, Theodora, under house arrest. The privations she suffered during her imprisonment were to cause her eventual death.
As the first groups of his partisans fleeing the capital arrived at Demotika, Kantakouzenos, by his own account, tried to negotiate with the new regency, but his approach was rebuffed. Finally forced to take decisive action, on 26 October 1341, the army (2,000 cavalry and 4,000 infantry, according to Gregoras) and his supporters, largely drawn from the land-holding aristocracy, proclaimed Kantakouzenos Emperor. Although he still presented himself officially as a junior colleague to John V, and claimed to be only acting in the boy's name, having staked his claim on the throne, he had effectively started a civil war. Kantakouzenos still hoped that negotiation might resolve the situation, but all his envoys were imprisoned and he and his supporters excommunicated by Patriarch John XIV. On 19 November 1341, the regency responded to Kantakouzenos' proclamation as Emperor with the formal coronation of John V.
Reaction to Kantakouzenos' proclamation caused a rift in Byzantine society, with the rich and powerful land-holding magnates (traditionally called the dynatoi, the 'powerful ones') who dominated the countryside quickly rallying to support him, while the ordinary population, often living in abject conditions and suffering under oppressive taxation, supported the Empress-dowager and the Patriarch. Apokaukos was especially quick to capitalize upon this division and foment popular dislike for the aristocracy, by widely publicizing the immense wealth confiscated from Kantakouzenos' and his supporters' houses and estates. In the words of Donald Nicol, "it was against him [Kantakouzenos] and everything that he stood for as a millionaire and landowning aristocrat that the people rose up. 'Kantakouzenism' became their war cry, the slogan of their discontent".