Nicene and Post-Nicene Fathers: Eusebius Pamphilius - Includes e-texts of Church History; The Life of the Blessed Emperor Constantine; The Oration of the Emperor Constantine; The Oration in Praise of the Emperor Constantine. - http://www.ccel.org/ccel/schaff/npnf201.toc.html
Early Christian Writings: Eusebius of Caesarea - Includes e-texts of: Against Hierocles; Demonstratio Evangelica (The Proof of the Gospel); Encomium on the Martyrs; The History of the Martyrs in Palestine; Theophania. - http://www.earlychristianwritings.com/fathers/