Under the influence of the July revolution of 1830, however, he also began to be drawn into the current of reaction; and though he still declared himself openly against absolutism, and never took up such a hostile attitude towards constitutional ideas as his brother-in-law King Frederick William IV., he allowed the reactionary system of surveillance which commended itself to the German Confederation after 1830 to be introduced into Bavaria (see BAVARIA: _History_). He continued, on the other hand, to do much for the economic development of the country. As a follower of the ideas of Friedrich List, he furthered the foundation of the Zollverein in the year 1833 and the making of canals. Railways he looked upon as a "necessary evil." In external politics peace was maintained on the whole after 1825. Temporary diplomatic complications arose between Bavaria and Baden in connexion with Louis's favourite project of winning back the part then belonging to Baden of the old Palatinate, the land of his birth, which was always very dear to him. Of European importance was his enthusiasm for the liberation of Greece from the rule of Turkey. Not only did he erect the _Propyläen_ at Munich in her honour, but he also helped her in the most generous way both with money and diplomatic resources. And after his second son Otto had become king of Greece in 1832, Greek affairs became from time to time the central point of his foreign policy. In 1835 he made a visit to Greece, partly political, partly inspired by his old interest in art. But his son proved unequal to his task, and in 1862 was forced to abdicate (see OTHO, KING OF GREECE). For this unfortunate issue Louis was not without blame; for from the very first, owing to an exaggerated idealism and love of antiquity, he had totally misunderstood the national character of the Greeks and the problems involved in the attempts to govern them by bureaucratic methods.