The northern seven provinces, led by Holland and Zeeland, started their independence as the United Provinces after 1581. The southern Netherlands were reconquered by the Spanish general Alexander Farnese, Duke of Parma. The Southern Netherlands passed to the Austrian Habsburgs after the War of the Spanish Succession in the early 18th century. After the French Revolutionary Wars they were joined with the northern Netherlands. They were made a single kingdom under the House of Orange at the 1815 Congress of Vienna. The south-eastern third of Luxembourg Province was made into Luxembourg. In 1830 the mostly Roman Catholic southern half became independent as the Kingdom of Belgium.