Perched above the Umbrian hills and nestled along the tranquil shores of Lake Bolsena, these two towns are bound by a story that changed the course of Christian devotion. From the miraculous events at Bolsena that inspired the Feast of Corpus Christi, to the awe-inspiring Cathedral of Orvieto that rose to enshrine the relic, this lecture explores how faith, art, and history converged to create one of the most enduring legacies of medieval Italy.