A conversation with Judith Herrin (King's College London) about the fascinating history of Ravenna between 400 and 800 AD. In this period, the city functioned first as a court of the western emperor, then as the seat of a Gothic kingdom loosely subordinate to Constantinople, and as the capital of the exarchate, the Italian province of the eastern empire. This made Ravenna a place of remarkable cultural fusion, and endowed it with spectacular monuments featuring superb mosaics. The conversation is based on Judith Herrin's recent book Ravenna: Capital of Empire, Crucible of Europe (Princeton University Press 2020).