Arabs in Turkey (Türkiye Arapları, عرب تركيا) refers to the 1.5-2 million citizens and residents of Turkey who are ethnically of Arab descent. They are the third-largest minority in the country after the Kurds and the Circassians and are concentrated in a few provinces in Southeastern Anatolia. In addition to this native group, millions of Arab Syrian refugees have sought refuge in Turkey since the beginning of the Syrian civil war in 2011. Besides the large communities of both foreign and Turkish Arabs in Istanbul and other large cities, most live in the south and southeast. Turkish Arabs are mostly Muslims living along the southeastern border with Syria and Iraq but also in Mediterranean coastal regions in the following provinces: Batman, Bitlis, Gaziantep, Hatay, Mardin, Muş, Siirt, Şırnak, Şanlıurfa, Mersin and Adana. Many tribes, in addition to other Arabs who settled there, arrived before Turkic tribes came to Anatolia from Central Asia in the 11th century. Many of these Arabs have ties to Arabs in Syria and Saudi Arabia, especially in the city of Raqqa. Arab society in Turkey has been subject to Turkification, yet some speak Arabic in addition to Turkish. The Treaty of Lausanne ceded to Turkey large areas that had been part of Ottoman Syria, especially in Aleppo Vilayet. Besides a significant Shafi'i Sunni population, about 300,000 to 350,000 are Alawites (distinct from Alevism). About 18,000 Arab Christians belong mostly to the Greek Orthodox Church of Antioch.. There are also few Arab Jews in Hatay and other Turkish parts of the former Aleppo Vilayet, but this community has shrank considerably since the late 1940s, mostly due to migration to Israel and other parts of Turkey. Arabs presence in what used to be called Asia Minor, dates back to the Hellenistic period. The Arab dynasty of the Abgarids were rulers of the Kingdom of Osroene, with its capital in the ancient city of Edessa (Modern day city of Urfa). According to Retsö, The Arabs presence in Edessa dates back to AD 49.