Alexander Farnese, duke of Parma, before Maastricht in June 1579. Detail of a 17th-century engraving depicting the Siege of Maastricht in 1579. Engraving by Pierre Du Ryer (ca.1606-1658) in the historical work " De Bello Belgico decades duae, 1555-1590" by Famiano Strada (1572-1649), published in 1632. Collection of the Peace Palace Library, The Hague.