King Ludwig I of Bavaria's romantic outlook gave rise to the adoption of new names for the administrative districts of Bavaria by a system of historical allusion. As such, the Rheinkreis officially became the Pfalz (Palatinate). The historic Electorate of the Palatinate was on both sides of the Rhine with Heidelberg and Mannheim as its capitals on the eastern side, whereas the new "Palatinate" established in 1815/16 was solely on the left bank of the Rhine. It included territories that were never part of the historical Palatinate (e.g., territories of the former Bishopric of Speyer, the imperial city of Speyer or Kirchheimbolanden, which had formerly belonged to the Weilburg branch of Nassau). To avoid confusion of the new Palatinate and the former one (and with the Upper Palatinate), the name Rhenish Palatinate (Rheinpfalz) became common and is still used today, but was never made its official name. Another term, that of Rhenish Bavaria (Rheinbayern), though used occasionally, never gained great currency, but can, nonetheless, be found sometimes on older maps. The Bavarian Royal Family tried to encourage Palatine unity with Bavaria by erecting a royal palace in Edenkoben, and through the restoration of Speyer Cathedral under the direct supervision of King Ludwig I himself. The new town of Ludwigshafen was named after the king. Despite these attempts, the Palatinate's representatives to the Bavarian Parliament always prided themselves on the claim that they came from a more progressive region. Indeed, they tried to promote their liberalism, which the French had introduced to the Palatinate, to the whole Bavarian kingdom. German historian Heiner Haan described the special status accorded the Palatinate within Bavaria as being one of a Hauptstaat (main state, i.e. Bavaria) with a Nebenstaat (alongside state, i.e. the Palatinate). In May/June 1849, after the failed revolution of 1848, and as part of the Imperial Constitution campaign, separatist elements wanted the district to secede from Bavaria and establish its own "Palatine Republic". A separatist uprising was suppressed by Prussian military intervention. The Palatinate's union with Bavaria persisted after it became part of the German Empire in 1871, and, indeed, after the Wittelsbach dynasty was deposed, and Bavaria became a free state of the Weimar Republic in 1918. In 1910 the town of Landau was declared independent from the Bezirksamt. After World War I, French troops occupied the Palatinate under the terms of the Treaty of Versailles. In 1920 the western Bezirksämter