Arab–Byzantine wars

The Arab–Byzantine wars were a series of long conflicts. They lasted from the 7th century to the 11th century. These wars occurred between the Byzantine Empire and successive Islamic caliphates.

The Byzantine Empire was a powerful state based in the Mediterranean. However, it had become very weak before the wars began. Long wars with the Sasanian Empire had exhausted their resources. Additionally, the bubonic plague, known as the Plague of Justinian, had killed many people. These two factors left the empire vulnerable to new challenges.

The conflict began during the early Muslim conquests. This was part of the initial spread of Islam under the Rashidun Caliphate. In the 630s, Arab forces attacked Byzantine provinces in the Levant and Africa. One major turning point was the Battle of the Yarmuk in 636.

During this battle, Muslim armies used the terrain to defeat Byzantine troops. Following this victory, the Arabs captured Syria and Egypt. Egypt was a very important province for the Byzantines. It provided a massive supply of wheat to the empire. Losing this food source caused shortages and weakened the Byzantine military.

As the wars progressed, the nature of the fighting changed. The Arab forces developed naval power to challenge Byzantine control of the sea.

The Mediterranean Sea became a major battleground for raids and counter-raids. After the Rashidun, the Umayyad Caliphate took control in 661. The Umayyads expanded further into North Africa and Asia Minor. They even attempted to capture the Byzantine capital, Constantinople, on two different occasions. These sieges happened in 674 to 678 and again from 717 to 718.

However, the city's heavy fortifications prevented the Arabs from seizing the capital.

After the failed second siege, the border between the two powers stabilized. The frontier was located at the Taurus Mountains in Asia Minor. This region became heavily fortified by both sides to prevent invasions. Because of the constant warfare, the area surrounding the mountains became depopulated. For a long time, the Byzantines were mostly on the defensive. They often avoided large open battles and retreated to strongholds. This changed after the mid-8th century when Byzantine forces began launching counter-offensives.

In 750, the Abbasid Caliphate replaced the Umayyads. The Abbasids were generally less focused on expanding their territory. Despite this, fighting continued with near-annual clashes until the mid-10th century.

During this period, Abbasid vassals conquered Crete in 827. They also gradually took control of Sicily between 831 and 878. Arab naval raids were very frequent during the 9th and early 10th centuries. These raids targeted coastal settlements in Italy and Dalmatia.

Eventually, the Byzantine Empire experienced a military resurgence. This happened under the Macedonian dynasty. From 976, the Byzantines pushed Arab forces back in Anatolia. They also recovered lost territories in northern Syria and Armenia. In 961, the Byzantines successfully reconquered the island of Crete.

This period showed that the Byzantine military had regained significant strength and organization.

By the end of the 10th century, the political landscape shifted again. The Fatimid Caliphate replaced the Abbasids as the main Arab power in the Levant. This change halted further Byzantine advances into Arab lands. The centuries of conflict had fundamentally reshaped the Mediterranean world. The wars influenced how different regions were governed and how they interacted. The struggle for control over land and sea lasted for hundreds of years, leaving a permanent mark on history.