Zulnoorain was the nickname of Uthman ibn Affan, may Allah be pleased with him, who was the third Rashid caliph. Zulnoorain literally means “the one who is blessed with two lights”, he was called thus because he married two of the daughters of Prophet Muhammad ﷺ. He married Ruqayyah, and when she died, he married her sister Umm Kulthum.