the four largest witch trials in Germany alongside the Fulda witch trials, the Würzburg witch trial, and the Bamberg witch trials, perhaps even the largest one in European history. The persecutions started in the diocese of Trier in 1581 and reached the city itself in 1587, where it was to lead to the death of about 368 people, and was as such perhaps the biggest mass execution in Europe in peacetime. This counts only those executed within the city itself. The exact number of people executed in all the witch hunts within the diocese has never been established; a total of 1,000 has been suggested but not confirmed. In the 17th and 18th centuries, the French-Habsburg rivalry brought war to Trier. Spain and France fought over the city during the Thirty Years' War. The bishop was imprisoned by Spain and the Holy Roman Emperor for his support to France between 1635 and 1645. In later wars between the Empire and France, French troops occupied the city during the Nine Years' War, the War of the Spanish Succession, and the War of the Polish Succession. After conquering Trier again in 1794 during the French Revolutionary Wars, France annexed the city and the electoral archbishopric was dissolved. After the Napoleonic Wars ended in 1815, Trier passed to the Kingdom of Prussia. Karl Marx, the German philosopher and one of the founders of Marxism, was born in the city in 1818. As part of the Prussian Rhineland, Trier developed economically during the 19th century. The city rose in revolt during the revolutions of 1848 in the German states, although the rebels were forced to concede. It became part of the German Empire in 1871. The synagogue on Zuckerbergstrasse was looted during the November 1938 Kristallnacht and later completely destroyed in a bomb attack in 1944. Multiple Stolperstein have been installed in Trier to commemorate those murdered and exiled during the Shoah. In June 1940 during World War II over 60,000 British prisoners of war, captured at Dunkirk and Northern France, were marched to Trier, which became a staging post for British soldiers headed for German prisoner-of-war camps. Trier was heavily bombed and bombarded in 1944. The city became part of the new state of Rhineland-Palatinate after the war. The university, dissolved in 1797, was restarted in the 1970s, while the Cathedral of Trier was reopened in 1974 after undergoing substantial and long-lasting renovations.