At the dawn of Reformation and the religious tensions that spread across Europe in the 16th century, the German city of Trier was the theatre of a particular religious craze considered a peak in the development of personal piety. During his second stay in the Mosellan city in 1512, emperor Maximilian of Habsburg ordered the clergy to excavate the tunica Christi, a relic that had remained buried under the main altar of the eastern choir of the cathedral since the end of the 12th century. This inventio was followed by a series of ostensiones to show the Holy Tunic to the mass of people gathered in front of the cathedral. Being located on the pilgrimage route to Aachen and Cologne, the churches of Trier took advantage of the influx of pilgrim...