 The details of the early conquest of Armenia by the Arabs are uncertain, as the various Arabic sources conflict with the Greek and Armenian sources, both in chronology and in the details of the events.However, the broad thrust of the Arab campaigns is consistent between the sources, allowing for a reconstruction of events by modern scholars.According to the Arabic sources, the first Arab expedition reached Armenia in 639/640, on the heels of their conquest of the Levant from the Byzantines and the start of the Muslim conquest of Persia.