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
Sermon on Law and Grace the Sermon was written somewhere between 1037 and 1050. Although commonly called the "Sermon on Law and Grace", the work bears a much longer title: The sermon is divided into two distinct parts. The first part presents the Grace of the New Testament surpassing and replacing the Law of the Old Testament. Hilarion retells the Old Testament account of Hagar, the handmaiden of Abraham, and Sarah, his wife. He likens Isaac, "the free son of a free mother", to the followers of Christianity, and Ishmael, "a servant (not a truly free man)", to the Jews. Hilarion emphasizes that the Law