Essential reading for reconstructing early Christianity, the writings of Eusebius of Caesarea (ca. 260-340 C.E.) have held a central place for historians of early Christianity. While apologists like Irenaeus and Origen have stood squarely in the spotlight, Eusebius has remained in the shadows. This work contends that the value of Eusebius’s own apologetic and theological writings has been neglected. It invites us to see Eusebius as a contender of the faith in his own right. To accomplish this goal, it takes us on a tour of two of Eusebius’s key documents: Eusebius’s Praeparatio Evangelica and Demonstratio Evangelica .