Preparation for the Gospel (Greek: Εὐαγγελικὴ προπαρασκευή, Euangelikē proparaskeuē), commonly known by its Latin title Praeparatio evangelica, is a work of Christian apologetics written by Eusebius in the early part of the fourth century AD. It was begun about the year 313, and attempts to prove the excellence of Christianity over pagan religions and philosophies. It was dedicated to Bishop Theodotus of Laodicea. Source: Wikipedia (en)