page_title: Arab–Byzantine wars
section_title: Early Abbasids
hierarchical_section_title: Arab–Byzantine wars / Stabilization of the frontier, 718–863 / Early Abbasids
caption_attribution_description: English: The Siege of Amorium by the Arabs in 838, from the Madrid Skylitzes, cod. Vitr. 26-2, fol. 59v
context_page_description: The Arab–Byzantine wars were a series of wars between the mostly Arab Muslims and the Byzantine Empire between the 7th and 11th centuries AD, started during the initial Muslim conquests under the expansionist Rashidun and Umayyad caliphs in the 7th century and continued by their successors until the mid-11th century.
  The emergence of Muslim Arabs from Arabia in the 630s resulted in the rapid loss of Byzantium's southern provinces to the Arab Caliphate. Over the next fifty years, under the Umayyad caliphs, the Arabs would launch repeated raids into still-Byzantine Asia Minor, twice besiege the Byzantine capital of Constantinople, and conquer the Byzantine Exarchate of Africa. The situation did not stabilize until after the failure of the Second Arab Siege of Constantinople in 718, when the Taurus Mountains on the eastern rim of Asia Minor became established as the mutual, heavily fortified and largely depopulated frontier.
context_section_description: Unlike their Umayyad predecessors, the Abbasid caliphs did not pursue active expansion: in general terms, they were content with the territorial limits achieved, and whatever external campaigns they waged were retaliatory or preemptive, meant to preserve their frontier and impress Abbasid might upon their neighbours. At the same time, the campaigns against Byzantium in particular remained important for domestic consumption. The annual raids, which had almost lapsed in the turmoil following the Abbasid Revolution, were undertaken with renewed vigour from ca. 780 on, and were the only expeditions where the Caliph or his sons participated in person.
  As a symbol of the Caliph's ritual role as the leader of the Muslim community, they were closely paralleled in official propaganda by the leadership by Abbasid family members of the annual pilgrimage (hajj) to Mecca. In addition, the constant warfare on the Syrian marches was useful to the Abbasids as it provided employment for the Syrian and Iraqi military elites and the various volunteers (muṭṭawi‘a) who flocked to participate in the jihad.
  Wishing to emphasize his piety and role as the leader of the Muslim community, Caliph Harun al-Rashid (r. 786–809) in particular was the most energetic of the early Abbasid rulers in his pursuit of warfare against Byzantium: he established his seat at Raqqa close to the frontier, he complemented the thughur in 786 by forming a second defensive line along northern Syria, the al-'Awasim, and was reputed to be spending alternating years leading the Hajj and leading a campaign into Anatolia, including the largest expedition assembled under the Abbasids, in 806.
  Continuing a trend started by his immediate predecessors, his reign also saw the development of far more regular contacts between the Abbasid court and Byzantium, with the exchange of embassies and letters being far more common than under the Umayyad rulers. Despite Harun's hostility, "the existence of embassies is a sign that the Abbasids accepted that the Byzantine empire was a power with which they had to deal on equal terms" (Kennedy).
  Civil war occurred in the Byzantine Empire, often with Arab support. With the support of Caliph Al-Ma'mun, Arabs under the leadership of Thomas the Slav invaded, so that within a matter of months, only two themata in Asia Minor remained loyal to Emperor Michael II. When the Arabs captured Thessalonica, the Empire's second largest city, it was quickly re-captured by the Byzantines. Thomas's 821 siege of Constantinople did not get past the city walls, and he was forced to retreat.
  The Arabs did not relinquish their designs on Asia Minor and in 838 began another invasion, sacking the city of Amorion.
caption: The siege of Amorium, miniature from the Madrid Skylitzes
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