of the Kingdom of Greece in 1832, the architecture of Greece was mostly influenced by the Neoclassical architecture. For Athens, the first King of Greece, Otto I, commissioned the architects Stamatios Kleanthis and Eduard Schaubert to design a modern city plan. The Old Royal Palace was the first important public building to be built, between 1836 and 1843. Later, in the mid- and late 19th century, Theophil von Hansen and Ernst Ziller took part in the construction of many neoclassical buildings. Theophil von Hansen designed his first building, the National Observatory of Athens, and two of the three contiguous buildings forming the so-called "Athens Classical Trilogy", namely the Academy of Athens (1859) and the National Library of Greece (1888), the third building of the trilogy being the National and Capodistrian University of Athens (1843), which was designed by his brother Christian Hansen. Also he designed the Zappeion Hall (1888). Ernst Ziller also designed many private mansions in the centre of Athens which gradually became public, usually through donations, such the mansion of Heinrich Schliemann, Iliou Melathron (1880). The city of Nauplio is also an important example of Neoclassical architecture along with the island of Poros. Hungary The earliest examples of neoclassical architecture in Hungary may be found in Vác. In this town the triumphal arch and the neoclassical façade of the Baroque Cathedral were designed by the French architect Isidor Marcellus Amandus Ganneval (Isidore Canevale) in the 1760s. Also the work of a French architect, Charles Moreau, is the garden façade of the Esterházy Palace (1797–1805) in Kismarton (today Eisenstadt in Austria). The two principal architects of Neoclassicism in Hungary were Mihály Pollack and József Hild. Pollack's major work is the Hungarian National Museum (1837–1844). Hild is famous for his designs for the Cathedral of Eger and Esztergom. The Reformed Great Church of Debrecen is an outstanding example of the many Protestant churches that were built in the first half of the 19th century. This was the time of the first iron structures in Hungarian architecture, the most important of which is the Chain Bridge (Budapest) by William Tierney Clark. Malta Neoclassical architecture was introduced in Malta in the late 18th century, during the final years of Hospitaller rule. Early examples include the Bibliotheca (1786), the De Rohan Arch (1798) and the Hompesch Gate (1801). However, neoclassical architecture only became popular in Malta following the establishment of British rule in