His descendants founded the PERSON@1 caliphate in NUMBER@1 C.E. Early Years PERSON@2 was one of the youngest brothers of PERSON@3 's father PERSON@4 , born only a few years before his nephew PERSON@3 -LRB- NUMBER@2 - NUMBER@3 CE -RRB- .

Key Facts He was only born a few years before his nephew PERSON@3 , and was one of PERSON@3 's father 's youngest brothers .
