Thomas Patrick Hughes, A Dictionary of Islam — 'Usman (1885)
“ He is known amongst Muslims as Zu 'n-Xiirain, " The Possessor of the Two Lights," because he married two of the Prophet's daughters, Ruqaiyah and Ummu Kulsum. His chief merit with regard to the cause of Islam was the second and final revision of the sacred book, which he caused to be made, and of which an exhaustive account has been given in our article on the Qur'an. ”
