عُثْمَانُ ذُو النُّورَيْنِ
ʿUthmān, the possessor of the two lights.
The well-known title Dhū al-Nūrayn refers to his marriages to two daughters of the Prophet ﷺ, Ruqayyah and, after her death, Umm Kulthūm. This was a distinctive familial honor.
Kinship with the Prophet and service to religion are significant merits. Yet one virtue does not, by itself, settle every comparison of overall rank; early scholars differed about the relative precedence of ʿUthmān and ʿAlī.