Most disputes of the early Christian era concerned the nature and identity of Jesus Christ.
They occurred within the context of intense cultural, political and theological conflict over a period of several centuries.
The doctrine of the Trinity was a product of these debates, reaching its final form in the 5th Century AD.
Bercot, A Dictionary of Early Christian Beliefs, 1998.
Dunn, Did the First Christians Worship Jesus?, 2010.
Ferguson, et al., New Dictionary of Theology, 1988.
Hanson, The Search for the Christian Doctrine of God, 2006.
Kelly, Early Christian Doctrines, 2006.
Pelikan, Credo, 2005.
Rubenstein, When Jesus Became God, 2000.
Williams, Arius: Heresy and Tradition, 2009.