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Muslim conquest of Syria

7th-century conquest by the Rashidun Caliphate

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Through Muhammad and Roman Empire

Clashes between the Muslims and the Byzantines on the southern Levantine borders of the Byzantine Empire had occurred previously during the lifetime of Muhammad, with the Battle of Mu'tah in 629 CE. However, the actual conquest did not begin until 634, two years after Muhammad's death. It was led by the first two Rashidun caliphs who succeeded Muhammad: Abu Bakr and Umar. During this time, Khalid ibn al-Walid was the most important commander of the Rashidun army. In the aftermath of the conquest, Syria was brought under Arab Muslim rule and developed into the provincial region of Bilad al-Sham.

Background

Byzantine Syria

Syria had been under Roman rule for seven centuries prior to the Arab Muslim conquest and had been invaded by the Persian Sasanian Empire on a number of occasions during the 3rd, 6th and 7th centuries; it had also been subject to raids by the Sasanian Empire' Arab allies, the Lakhmids. During the Roman period, beginning after the Siege of Jerusalem in the year 70, the Levant (Judea, Samaria, and the Galilee) was renamed Palaestina, subdivided into Diocese I and II. The Romans also renamed an area of land including the Negev, Sinai, and the west coast of the Arabian Peninsula as Palaestina Salutaris, sometimes called Palaestina III or Palaestina Tertia. Part of the area was ruled by the Arab vassal state of the Ghassanids' symmachos.

During the last of the Roman-Persian Wars, beginning in 602, the Persians under Khosrau II had succeeded in occupying Syria, Palestine and Egypt for over a decade before being forced by the victories of Heraclius to conclude the peace of 628. Thus, on the eve of the Muslim conquests the Romans (or Byzantines as modern Western historians conventionally refer to Romans of this period) were still in the process of rebuilding their authority in these territories, which in some areas had been lost to them for almost twenty years. Politically, the Syrian region consisted of two provinces: Syria proper stretched from Antioch and Aleppo in the north to the top of the Dead Sea. To the west and south of the Dead Sea lay the province of Palestine.

Byzantine Syria was mostly home to Aramaic and Greek speakers and a partly Arab population, especially in its eastern and southern parts. The Ghassanid tribe, who migrated from Yemen to Syria, converted to Christianity and served as foederati for the Eastern Roman empire like the Tanukh before them. Thereafter, they ruled a semi-autonomous state with their own king under Roman vassalage. The Ghassanid dynasty became one of the honoured princely dynasties of the Empire, with the Ghassanid king ruling over the Arabs in Jordan and Southern Syria from his capital at Bostra. The last of the Ghassanid kings, who ruled at the time of the Muslim invasion, was Jabala ibn al-Ayham.

The Byzantine Emperor Heraclius, after re-capturing Syria from the Sassanians, set up new defense lines from Gaza to the south end of the Dead Sea. These lines were only designed to protect communications from bandits, and the bulk of the Byzantine defenses were concentrated in Northern Syria facing the traditional foes, the Sassanid Persians. The drawback of this defense line was that it enabled the Muslims, advancing from the desert in the south, to reach as far north as Gaza before meeting regular Byzantine troops.

The 7th century was a time of rapid military change in the Byzantine Empire. The empire was certainly not in a state of collapse when it faced the new challenge from Arabia after being exhausted by recent Roman–Persian Wars, but utterly failed to tackle the challenge effectively.

Rise of the Caliphate

Military confrontations with the Byzantine Empire began during the lifetime of Muhammad. The Battle of Mu'tah was fought in September 629 near the village of Mu'tah, east of the Jordan River and Karak in Karak Governorate, between the forces of the Islamic prophet Muhammad and the forces of the Byzantine Empire and their Arab Christian Ghassanid vassals. In Islamic historical sources, the battle is usually described as the Muslims' attempt to take retribution against the Ghassanids after a Ghassanid official executed Muhammad's emissary who was en route to Bosra. During the battle the Muslim army was routed. After three Muslim leaders were killed, the command was given to Khalid ibn al-Walid and he succeeded in saving the rest of the forces. The surviving Muslim forces retreated to Medina.

After the Farewell Pilgrimage in 632, Muhammad appointed Usama ibn Zayd as the commander of an expeditionary force which was to invade the region of Balqa in the Byzantine Empire. This expedition was known as the Expedition of Usama bin Zayd and its stated aim was to avenge the Muslim losses at the Battle of Mu'tah, in which Usama's father and Muhammad's former adopted son, Zayd ibn Harithah, had been killed. Usama's expedition in May/June 632 was successful and his army was the first Muslim force to successfully invade and raid Byzantine territory.

Muhammad died in June 632, and Abu Bakr was appointed Caliph and political successor at Medina. Soon after Abu Bakr's succession, several Arab tribes revolted against him in the Ridda wars (Arabic for the Wars of Apostasy). The Campaign of the Apostasy was fought and completed during the eleventh year of the Hijri. The year 12 Hijri dawned, on 18 March 633, with Arabia united under the central authority of the Caliph at Medina.

Whether Abu Bakr intended a full-out imperial conquest or not is hard to say; he did, however, set in motion a historical trajectory that in just a few short decades would lead to one of the largest empires in history, starting with a confrontation with the Persian Empire under the general Khalid ibn al-Walid.

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