Islamic Rulers .... existed from approximately AD 622 1258, a period roughly divided by four phases: The Hijrah Era (AD 622 632), the Rightly Guided Caliphs (632 661 .... (1377 6 )
Ali ibn Abi Talib .... The first four caliphs, known to Sunni Muslims as the "Rightly Guided" Caliphs," were all early converts, companions of the Prophet, and members of the Quraysh .... (1765 7 )