During the late Middle Ages the number of relics further increased. A septennial Pilgrimage of the Relics (Dutch: "Heiligdomsvaart") attracted tens of thousands of pilgrims. At these occasions, the main relics were shown to the pilgrims gathered in Vrijthof square from the dwarf gallery. In 1579, the church treasure suffered badly during the Sack of Maastricht by the Spanish troops led by the Duke of Parma. In 1634, under the threat of war, the treasure was brought to Liège, where it remained for twenty years.