Umm al walad
As the child is a child of her owner, the child is considered freeborn, and legitimate. In 740, Zayd ibn Ali tried to overthrow the caliphate. This marked a turning point for caliphs with slave mothers. In 744, Yazid III was the first Umayyad caliph with a slave mother.The last three Umayyad caliphs, and most Abbasid caliphs had slave mothers.