- Early Christians
- Early Spread of Christianity
- Women in the Early Christian Church
- Early Jewish-Christian Friction
- Early Christian Churches and Holy Places
- Christianity in the Roman Empire: History, Development, Influences
- Early Christian Community in the Roman Empire
- Christian Catacombs in Rome
- Persecution of Christians in Ancient Rome: Why, Laws, Punishments
- Persecution and Treatment of Christians Under Different Roman Emperors
- Victims of Roman Christian Persecution
- Famous Early Saints and Martyrs
- Diocletian and the Persecution of Christians
- Constantine the Great (AD 312-37): His Life, Rise to Power, Death and Arch
- Constantine the Great (AD 312-37) as Ruler of the Roman Empire
- Constantine the Great (A.D. 312-37) and Christianity in the Roman Empire
- Pro-Christian Laws and Reforms Enacted by Constantine the Great
- Christianity in the Roman Empire After Constantine
- Art and Texts from the Early Christian Period
- Early Christian Councils
- Council of Nicaea in A.D. 325: Debate, Arius and the Nicene Creed
- Early Christian Beliefs and Theology
- Early Christian Theologians
- Church of the Holy Sepulchre: Structure, Tomb of Jesus, Disputes
- Early Christianity in Europe
- Catholic-Orthodox Split: Friction, Disputes, Iconoclasm
- Heretics — Cathars and Waldensians — and Their History and Deaths