By  Periklis    Deligiannis

Walls of Constantinople

The Walls of Constantinople today.

In 661 AD, the new caliph Muawiyah (Muāwiyah ibn Abī Sufyān AD 602–680)became the absolute master of the Islamic-Arab Caliphate after the murder of his antagonist, Ali. He made Damascus the Arabic capital, while Syria became the new political center of the Islamic world. The advanced peoples of Syria-Palestine and Egypt were the main supporters of the new Ummayad Dynasty (AD 661-750) of caliphs founded by Muawiyah. The new caliph based his power on the old Byzantine administrative officials, because the Arabs had not yet the required experience in governance issues. The Ummayad Caliphate had its political-administrative center in former Hellenistic Syria and used the Greek of the former Byzantine rule as its administrative language (and also used the Greek/Byzantine administrative infrastructure), thereby closely resembled to a more extensive Seleucid Kingdom. The main politico-military supporters of the Ummayads were the pre-Islamic local Arabs of Syria and Palestine (the Arab tribes of the Ituraeans, Palmyrans, Gasanids and others), who had become Muslims.
After the proclamation of Muawiyah as caliph, the Arab forces moved again against Byzantium (Eastern Roman Empire), following two directions of attack. A portion of them was carrying out devastating raids in Asia Minor, while another portion attacked the Byzantine Exarchate of Africa (modern NW Africa). One by one the Byzantine fortresses and the (Berber) tribes of the Numidians, Mauri and Maurusians were subjugated by the Arab invaders.