An introductory survey of life and thought in ancient and early medieval Christianity from the Gnostic crisis (2nd century) to the parting of the Greek and Latin churches (11th century). Some of the issues covered are: the multicultural and multi ethnic character of ancient Christianity; the rise of doctrinal and biblical canons; ethics of war, wealth and sexuality; the flourishing of the ascetical principle; major theological writers and controversies of the early period.