After the Peace of Westphalia in 1648, control of Landau was ceded to France, although with certain ill-defined reservations. Landau was later part of France from 1680 to 1815, during which it was one of the "Décapole", the ten free cities of Alsace, and received its modern fortifications by Louis XIV's military architect Vauban in 1688–99, making the little town (its 1789 population was approximately 5,000) one of Europe's strongest citadels. In the War of the Spanish Succession it had four sieges. After the siege of 1702 lost by the French, an Imperial garrison was installed in Landau. In a subsequent siege from 13 October to 15 November 1703 the French regained the town, following their victory in the Battle of Speyerbach. A third siege, begun on 12 September 1704 by Louis, Margrave of Baden-Baden, ended on 23 November 1704 with a French defeat. During this siege King Joseph I arrived at Landau coming from Vienna in a newly developed convertible carriage. This carriage would become very popular and became named the landau in English, or Landauer in German. The French recaptured Landau once more in a final siege which lasted from 6 June to 20 August 1713 by Marshal General Villars.