De Lacy O'Leary,
Arabic Thought and Its Place in History…
(1922)
“ They were those who would have gone forward to conquest under any efficient leader as soon as it was clear that Persia and the Greek Empire were vulnerable, and to them it was a detriment that union under a leader incidentally involved adherence to a new religion. At the head of these purely secular Arabs was the Umayyad clan of the tribe of Quraysh, and the main thing which gained their continued adherence to Islam was that the Prophet himself had belonged to that tribe and so the prestige of Islam involved that of the Quraysh who thereby became a kind of aristocracy. ”
