Philip the Arab and Christianity that appear—save for one reference to Ishmael—figure in the political history of the first three centuries of the Christian era. To Eusebius, the Saracens of the 4th century are direct-line descendants of the biblical Ishmaelites, descendants of the handmaid, Hagar, and the patriarch, Abraham. They are thus outcasts, beyond God's Covenant with the favored son of Abraham, Isaac. The twin images of the Ishmaelite and the Saracen—outcasts and "latrones", raiders of the frontiers—reinforce each other and give Eusebius' portrait of the Arab nation an unhappy color. He may have been reluctant to associate the first Christian emperor with a people
Ishmael (). At the age of 14, Ishmael was freed along with his mother. The Lord's covenant made clear Ishmael was not to inherit Abraham's house and that Isaac would be the seed of the covenant: "Take your son, your only son, whom you love and go to the region of Moriah." (Genesis ) Abraham gave Ishmael and his mother a supply of bread and water and sent them away. Hagar entered in the wilderness of Beer-sheba where the two soon ran out of water and Hagar, not wanting to witness the death of her son, set the boy some distance