"At the end of the fourth century, as the power of Rome faded and Constantinople became the seat of empire, a new capital city was rising in the West. Here, in Ravenna on the coast of Italy, Arian Goths and Catholic Romans competed to produce an unrivaled concentration of buildings and astonishing mosaics. For three centuries, the city attracted scholars, lawyers, craftsmen, and religious luminaries, becoming a true cultural and political capital....