He was the son of the second king of Iraq, Ghazi, who was killed in an automobile accident when Faisal was three. For most of his reign his uncle Abdul Illah ruled as regent (until Faisal came of age in 1953).
As a teen, Faisal attended Harrow School in the United Kingdom, together with his cousin King Hussein of Jordan. The two boys were close, and reportedly planned even then to merge their two realms to counter what they considered the threat of militant pan-Arabnationalism.
The reign of Faisal, together with the new state, came to an end a mere five months later. During the summer Hussein asked for Iraqi military assistance in Jordan. A military officer, Abdul Karim Qassim, used the resulting troop movements as the opportunity to stage a coup, capturing Baghdad and proclaiming a republic on July 14. On that same day the young king, other members of his family, and his chief minister Nuri as-Said were murdered.
Failing male heirs of King Faisal (which occurred in 1958 when FaisalII died), succession is next to lawfully begotten descendants in male line of his brothers, the sons of King Hussein of Hejaz (Sharif Hussein ibn Ali, the Emir of Mecca and King of Hejaz), according to primogeniture, provided they are also Iraqi nationals.
Ali Bin al-Hussein is a cousin to the late King FaisalII: his father was Sharif Al-Hussein bin Ali, whose father Ali bin Abdullah Kamil was the brother-in-law and agnatic cousin of Hussein of Hejaz.
Sharif Ali Bin al-Hussein's mother is Princess Badia, daughter of King Ali of Hejaz, aunt of the late King FaisalII, and a granddaughter of King Hussein of Hejaz.