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to the 5th the Arabs persecuted Aby in i an Christians, who were ‘established by Roman emperors. In 512 A.c. the Aby in i ans conquered Yaman, and held it till 634 a.c., when Islam overwhelmed them, “so that they slept for a you sand years, forgetful of the world by which they were forgotten ” (Gibbon). As early as Solomon’s time, says Prof.