poleis, and the line separating between the colonists and the colonized blurred. The idioms Syrian and Greek were used by Rome to denote civic societies instead of separate ethnic groups. The Aramaeans assimilated the earlier Greek and Roman populations through their language; combined with the religion of Christianity, most of the inhabitants turned into Syrians (Aramaeans). Islam and the Arabic language had a similar effect where the Aramaeans themselves became Arabs regardless of their ethnic origin following the Muslim conquest of the Levant. The presence of Arabs in Syria is recorded since the 9th century BC, and Roman period historians, such as Strabo, Pliny the Elder, and Ptolemy, reported that Arabs inhabited many parts of Syria. What antiquity's writers meant by the designation "Arab" is debated; the historian Michael Macdonald suggested that the term is an ethnic designation based on an "ill-defined complex of linguistic and cultural characteristics", while according to academic consensus, "Arab", in addition to it being an ethnic name, had a social meaning describing a nomadic way of life. The urheimat of the Arab ethnos is unclear; the traditional 19th century theory locates this in the Arabian Peninsula, while some modern scholars, such as David Frank Graf, note that the epigraphic and archaeological evidence render the traditional theory inadequate to explain the Arabs' appearance in Syria. The Arabs mentioned in Syria by Greco-Roman writers were assimilated into the newly formed "Greco–Aramaean culture" that dominated the region, and the texts they produced were written in Greek, Aramaic and Old Arabic, the precursor of Classical Arabic, which was not a literary language; its speakers used Aramaic for writing purposes. Arabization On the eve of the Rashidun Caliphate conquest of the Levant, 634 AD, Syria's population mainly spoke Aramaic as the Lingua franca, while Greek was the language of administration. Arabization and Islamization of Syria began in the 7th century, and it took several centuries for Islam, the Arab identity, and language to spread; the Arabs of the caliphate did not attempt to spread their language or religion in the early periods of the conquest, and formed an isolated aristocracy. The Arabs of the caliphate accommodated many new tribes in isolated areas to avoid conflict with the locals; caliph Uthman ordered his governor, Muawiyah I, to settle the new tribes away from the original population. Syrians who belonged to Monophysitic denominations welcomed the Muslim Arabs as liberators. The Abbasids in