The volume gives a broad overview of ancient non-Nicene theologies; surveys key councils and events from before Nicaea until the final demise of institutional non-Nicene Christianity in 589; and lays out both the historical background and the theological underpinnings of the thought of Arius himself and of his allies and their successors, down to the repudiation of non-Nicene Christianity by the Germanic kingdoms. This content is organized around the contexts in which Arian thought is encountered, differentiating doctrines across time and space while also demonstrating both intellectual and personal continuity.