During the reign of Prince William Henry from 1741 to 1768, the coal mines were nationalized and his policies created a proto-industrialized economy, laying the foundation for Saarland's later highly industrialized economy. Saarbrücken was booming, and Prince William Henry spent on building and on infrastructure like the "Saarkran" river crane (1761), far beyond his financial means. However, the famous baroque architect Friedrich Joachim Stengel created not only the "Saarkran", but many iconic buildings that still shape Saarbrücken's face today, like the "Friedenskirche" (Peace Church), which was finished in 1745, the "Old City Hall" (1750), the catholic "St. John's" "Basilica" (1754), and the famous "Ludwigskirche" (1775), Saarbrücken's landmark.