he was born in about the year 583 and was ruler for 12 years. during his time as ruler he conquered khurasan and the regions of the west of the arabian peninsula. he also united the muslim upon one uniform version of the quran. he was well known for marrying two of muhammad's daughters, ruqayyah and umm kulthum, both at different times. for this, he became known as "dhu al-nurayn", the "possessor of two lights". he participated in both immigrations, first to ethiopia and then to medina.