Judith Herrin, an expert in Late Antique and Byzantine Studies, joins Robin Whelan, who specializes in Mediterranean history, to discuss Arianism's fascinating journey through the 4th century. They explore how the Ostrogoths, Vandals, and Visigoths adopted this form of Christianity from Roman missionaries. The duo highlights the theological tensions ignited by Arius and the infamous Council of Nicaea, alongside Theoderic's role in a predominantly Catholic Italy. Their discussion unveils Arianism's shift from an orthodox view to a heretical status, impacting Christian history profoundly.