Siege of Adrianople

Siege of Adrianople
Conflict	Siege of Adrianople
Partof	Arab–Byzantine Wars
Date	715–716
Place	Adrianople (Edirne), Thrace, Byzantine Empire
Result	Byzantine victory / siege repulsed
Combatant1	Byzantine Empire
Combatant2	Umayyad Caliphate
Commander1	Anastasios II
Commander2	Maslama ibn Abd al-Malik
Strength1	Unknown
Strength2	Estimated expeditionary force
Casualties1	Heavy civilian and military losses reported
Casualties2	Significant losses, retreat to Constantinople campaign

Siege of Adrianople

The Siege of Adrianople was a major 8th-century military operation in which forces of the Umayyad Caliphate under Maslama ibn Abd al-Malik attempted to capture the strategic city of Adrianople (modern Edirne) in the theme of Thracia during the Arab–Byzantine Wars. The operation formed part of a wider campaign culminating in the contemporaneous Siege of Constantinople (717–718) and intersected with politics involving the Byzantine Empire and the court of Caliph Sulayman ibn Abd al-Malik. Sources link the siege to broader tensions following the reigns of Philippikos Bardanes, Anastasius II, and Leo III the Isaurian.

Background

Adrianople stood as a key city on the Via Egnatia and the approaches to Constantinople after the Battle of Sebastopolis and the fallout from the Second Arab Siege of Constantinople. The Umayyad campaigns under Al-Walid I and Sulayman ibn Abd al-Malik sought to exploit divisions in the Byzantine polity following coups by Anastasios II and Philippikos Bardanes and local disruptions from Bulgar incursions tied to the Onogurs and Avars. Maslama had previously campaigned in Armenia and Cilicia and coordinated with fleets linked to Damascus and the Levantine coast. Control of Adrianople would secure lines from Thrace into Bithynia and pressure the court at Constantinople while threatening passes toward Nicomedia and the Bosporus Strait.

Course of the Siege

Maslama advanced from bases in Kibyra and Anatolia with veteran contingents raised from provinces including Syria, Iraq, and Egypt. His forces reached Adrianople amid concurrent operations near Trebizond and the Isaurian hinterlands. The siege began with encirclement, investment of gates, and artillery emplacement resembling techniques used at the Siege of Constantinople (674–678). Byzantine defenders, drawing on themes such as Opsikion and local militias tied to the Exarchate of Ravenna diplomacy, held the walls while seeking relief from imperial forces under commanders loyal to Anastasios II and Nobles aligned with Theodosius III's faction. Skirmishes involved cavalry detachments resembling Mardaites auxiliaries and allied contingents from the Bulgar Khanate; naval maneuvers referenced Byzantine squadrons employing tactics seen at Battle of the Masts.

Attempts by Maslama to storm the seams of the fortifications used siege engines comparable to those documented at Siege of Tyre (637) and employed sapper techniques associated with Persian models preserved since the Sasanian Empire. Relief efforts converged from garrisons in Macedonia and Thessalonica, forcing Maslama to contend with harassment, supply shortages, and outbreaks of disease as described in chronicles echoing the Chronicle of Theophanes and Theophanes the Confessor. Ultimately the Umayyad force abandoned a full investment to concentrate on the campaign against Constantinople, withdrawing along routes that passed near Edirne and Kavala.

Defenses and Siegecraft

Adrianople's defenses combined Roman-era walls, towers, and gates augmented by Byzantine repair programs similar to those implemented after Heraclius's eastern campaigns. The city leveraged urban fortification techniques traced to Procopius's descriptions and entertained innovations in counter-siege measures: boiling liquids, archery from battlements, and mobile countermining echoing lessons from sieges of Nicaea and Antioch. Defenders employed thematic troops drawn from Thracesian Theme and auxiliary forces reflecting the organization of the theme system. Maslama's engineers used mangonel-like stone-throwers and incendiary materials related to the incendiary recipes later known as Greek fire precursors; naval coordination attempted to blockade riverine and marshland approaches reminiscent of operations on the Golden Horn.

Casualties and Aftermath

Contemporary accounts report heavy casualties among both Byzantine soldiers and Adrianople's civilian population, with demographic disruption similar to other 8th-century sieges documented in the Chronicon Paschale and later chroniclers. Umayyad losses were also significant, contributing to Maslama's decision to reallocate forces to the Constantinople (717–718) campaign. The immediate aftermath saw refugees flee along routes toward Nicaea and Thessalonica while the Byzantine administration instituted repairs and rehousing efforts drawing on fiscal practices described under Justinian II and Constans II. Political fallout influenced military appointments at Sigriada and reinforced the need for defensive coordination across themes including Opsikion and Thracias.

Political and Strategic Significance

The siege underscored Adrianople's strategic value as a gateway to Constantinople and as a focal point in the contest between the Umayyad Caliphate and the Byzantine Empire. Although the siege did not yield a decisive conquest, it strained Umayyad logistics and shaped Maslama's operational choices leading into the major investment of Constantinople. The episode influenced subsequent policy decisions by emperors such as Leo III the Isaurian and affected diplomatic contact with powers like the First Bulgarian Empire, the Frankish Kingdom, and frontier groups such as the Slavs and Avars. Historiographically, the siege features in narratives by Theophanes the Confessor, Nikephoros I, and later chroniclers of the Middle Byzantine period as an example of frontier warfare at the transition between early and middle Byzantine military systems.

Category:Sieges involving the Byzantine Empire Category:Sieges involving the Umayyad Caliphate Category:8th-century conflicts