Arianism (Catholic Encyclopedia)
Council of Chalcedon (451) Catholic Encyclopedia
Council of Ephesus (431) Catholic Encyclopedia
Dissent From the Creed: Heresies Past and Present (Russell Shaw)
Dositheans (Catholic Encyclopedia)
Early Christian Writings – Early Church Fathers
Early Church Fathers – a 38-volume collection of writings from the first 800 years of the Church.
First Council of Nicaea (325) Catholic Encyclopedia
First General Council of Constantinople 381) Catholic Encyclopedia
Guide to Early Church Documents – “This hypertext document contains pointers to Internet-accessible files relating to the early church, including canonical documents, creeds, the writings of the Apostolic Fathers and other historical texts relevant to church history.”
Heresy – Catholic Encyclopedia
Latin Literature in Early Christianity – Catholic Encyclopedia
Marcion
Marcionites (Catholic Encyclopedia)
Pelagius and Pelagianism – Catholic Encyclopedia
Semi-pelagianism – Catholic Encyclopedia
The First General Council of Nicaea, 325 – by Mgr. Philip Hughes, from “The Church in Crisis: A History of the General Councils, 325 – 1870
The First General Council of Constantinople, 381 – by Mgr. Philip Hughes, from “The Church in Crisis: A History of the General Councils, 325 – 1870
The Great Heresies (Hilaire Belloc)
The Fathers of the Church – New Advent site – Writings.
The Great Heresies (Hilaire Belloc)
The General Council of Ephesus, 431 – by Mgr. Philip Hughes, from “The Church in Crisis: A History of the General Councils, 325 – 1870
The General Council of Chalcedon, 451 – by Mgr. Philip Hughes, from “The Church in Crisis: A History of the General Councils, 325 – 1870