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Muhammad's death in 11/632 was followed in his successor Abū Bakr's time by a crisis of apostasy, the Ridda, which put both the religion and the government of Medina in jeopardy. The emergence of the Sāsānian navy owed a great deal to the co-operation which existed with the Arabs. Khusrau I intervened in Yemenī affairs on the pretext of aiding the Arabs against Byzantium, with the result that Iranian forces replaced Ethiopian there. Among the secretaries at the Sāsānian court was one for Arab affairs. From ancient times Iran had had contacts varying in degree of closeness and amity with the Arabs. Before the Sāsānian era, Arab tribes had settled in the Tigris-Euphrates region, though at the beginning of the era Ardashīr I had wrested from them the district known as Maisan, in southern Iraq on the Persian Gulf. Iraq and Syria were in the hands of the Khurāsāns, to be followed by Egypt and Arabia.
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