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Develtos (, , Δηβελτός, Δεουελτός, Δεούελτος, Διβηλτóς) or Deultum was an ancient city and bishopric in Thrace. It was located at the mouth of the river Sredetska reka on the west coast of Lake Mandrensko, previously part of the Gulf of Burgas, and near the modern village of Debelt.
Develton was annexed to the Roman Empire in 46 AD and became part of the Thracia.Ruscu (2007), p. 214 The construction of a colonia for veterans of the VIII Augusta Roman legion at Develton was likely planned prior to 69 AD, but was delayed due to the eruption of civil war of 69 AD.Campbell (2006), p. 218 The veterans may have been settled at Develton due to its proximity to the neighbouring region of Moesia, where VIII Augusta was formerly based. The location was also chosen for a veterans colony as the veterans had the appropriate training necessary for the drainage of local marshland, therefore allowing the area to be developed and exploited.Richmond (1945), p. 23 The colonia was thus built during the reign of Emperor Vespasian, and was named Colonia Flavia Pacis Deultensium, or Colonia Flavia Pancensis Deultum.Sayles (1998), p. 31 The inclusion of "peace" ( Pacis) in the title of the colony probably referred to the conclusion of the civil war. The city had an extensive territory, as testified by inscriptions in Panchevo and Sladki Kladenci near Burgas.Soustal (1992), pp. 234–235
Pliny the Elder makes reference to the city in his Naturalis Historia.Birley (1986), p. 210 In 82 AD, the population of Deultum petitioned Titus Avidius Quietus to become a patron of the city.Birley (1981), p. 85 Commemorative bronze coins were minted by Emperor Trajan to celebrate the 30th anniversary of the foundation of Deultum.Dikov (2015) Between 130 and 150 AD, the city suffered serious damage from barbarian attacks.
By the end of the 2nd century and the beginning of the 3rd century, Deultum had an area of approximately 62 acres (0.25 sq km) and there were temples dedicated to Asclepius and Cybele. A mint was active at Deultum from the reign of Caracalla to that of Emperor Philip the Arab. The city is mentioned in the Antonine Itinerary, composed in the early 3rd century.Boeft et al. (2017), p. 150 Following his ascension to the throne, Emperor Philip the Arab travelled through Deultum in 244 en route from Circesium to Rome, and adventus coins were minted to celebrate his presence.Peachin (1991), p. 340
Deultum was sacked by Goths in the second half of the 3rd century and was rebuilt shortly after. The city later became part of the province of Haemimontus, and Emperor Diocletian travelled through Deultum in 294 whilst en route from Sirmium to Nicomedia.Connolly (2010), p. 51 Legions I Flavia Pacis, II Flavia Pacatiana, and III Flavia Pacis may have been levied at Deultum and its environs by Diocletian or Emperor Constantius II.DuBois (2015), p. 79
At the Battle of Deultum in the summer of 377 during the Gothic War of 376–382 an Eastern Roman army was defeated by a Goths raiding party outside Deultum,Wolfram (1990), p. 123 and the city was sacked. Deultum was later rebuilt on a smaller scale, and, in the second half of the 5th century, new walls were constructed and all unprotected buildings were demolished to ensure hostile forces did not use them as cover. However, the walls were destroyed by Slavs and Pannonian Avars at the end of the 6th century.
In May 812, Khan Krum besieged Develtos and in June the city surrendered.Sophoulis (2011), p. 222 Siphons used to shoot Greek fire, an incendiary naval weapon, were looted when the city was taken.Treadgold (1988), p. 185 Krum subsequently destroyed Develtos and its fortifications, and forcibly relocated the city's population to Bulgarian territory.Fine (1991), p. 98 The depopulation of Develtos suggests Krum did not initially plan to permanently occupy the territory.Treadgold (1988), p. 205 However, Krum later repopulated Develtos with Bulgarians, and annexed the city to a new province administered by his brother in 814. The province was subdivided into two districts, one on either side of the Tundzha, and Develtos was administered as part of the left side by the boyar Irataïs and his subordinates the strategoi Cordyles and Gregoras. Emperor Leo V's victory over Khan Omurtag in April 816 near Nesebar led to the negotiation and ratification of a treaty in September, which returned the city to Roman control.Treadgold (1988), pp. 216-217
As per the Treaty of 816, the Great Fence , a fortified earthwork palisade, was constructed by Bulgaria northwest of Develtos to mark the border between the two states.Hupchick (2017), p. 114 Following Bulgarian raids into Thrace in 853, the city was ceded by Empress Theodora to Khan Boris I,Hendy (1985), pp. 82-83 by which time Develtos was still partially ruined.Hupchick (2017), p. 131 Boris I restored the city to the Roman Empire,Hupchick (2017), p. 136 and may have been baptised at the city, in 864. An embassy sent by Pope Nicholas I to Emperor Michael III in 866 was prevented from entering the empire and was forced to wait 40 days at Develtos, after which the embassy abandoned its task and travelled to Pliska.McCormick (2001), pp. 143-144 The embassy was tasked with informing the emperor of the pope's condemnation of Patriarch Photios I of Constantinople, and consisted of Donatus, Bishop of Ostia, the deacon Marinus, and the priest Leo.
Develtos was ceded to Tsar Simeon I in the Treaty of 896, and designated as the site where the annual tribute to the Bulgarians was to be delivered. Simeon I launched his campaign against Constantinople by way of Develtos in the summer of 913, thus beginning the War of 913-927.Runciman (1988), pp. 82-83 As per the stipulations of the Treaty of 927, Tsar Peter I relinquished control of the city to Emperor Romanos I Lekapenos, and Develtos became part of the theme of Thrace.Runciman (1988), pp. 97-98
In 1087, Develtos was transferred to the newly created theme of Pomorie by Emperor Alexios I Komnenos.Madgearu (2013), p. 85 The city was the temporary refuge of Emperor Alexios III Angelos in mid-July 1203 after he had fled Constantinople when faced with the arrival of the Fourth Crusade.Garland (2002), p. 221 Develtos was conquered by the Second Bulgarian Empire after the Battle of Adrianople in 1205, but was recovered by Michael Glabas Tarchaneiotes in 1263. The city declined and was depopulated in the 14th century, either due to Turkish attacks, or due to the sedimentation of its lagoon. Develtos was conquered by the Ottoman Empire in 1396.Browning (1991)
Athanasius, Bishop of Develtos and , attended the Council of Ephesus in 431, and initially supported the teachings of Nestorius, Patriarch of Constantinople, but later adopted the orthodox position as declared at the council. Jovian or Jovinus attended the Synod of Constantinople in 448 and the Council of Chalcedon in 451. He also signed a letter alongside other bishops of Haemimontus to Emperor Leo I the Thracian in 457 to protest the murder of Saint Proterius of Alexandria. A bishop of Develtos is recorded at the Synod of Constantinople of 459.
Bishop Eustratius attended the Second Council of Nicaea in 787. Saint George, Archbishop of Develtos, was amongst those deported after the city's surrender to Krum in 812 and was tortured to death by Khan Omurtag in 815 with roughly 380 other martyrs who refused to renounce their faith.Treadgold (1988), pp. 214-215 The see was vacant in 869,Hendy (1985), pp. 83-84 but Bishop Symeon attended the Fourth Council of Constantinople in 879. By the second half of the 9th century, until the 12th century, the diocese of Develtos is attested as a suffragan of the Archdiocese of Edirne. Constantine, Bishop of Develtos, was active at the end of the 10th and beginning of the 11th century.
Develtos was nominally revived as a in 1933, and had the following incumbents:
In 2020, archaeologists discovered a sarcophagus from the 2nd or 3rd century AD with a Greek language inscription which proved that Develtos was a port town. Deultum Roman colony near Burgas had port In 2024, an amulet believed to be the earliest Christian relic in the region was discovered there. The amulet, dating from the late 2nd to early 3rd century AD, contains the first known reference to Christ in the region.
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