The Habsburg Monarchy built a Vauban-type fort there to defend it from the Ottoman Empire, and that fort would remain a bone of contention for the two empires. In 1699 the island came under Ottoman control, however, it was recaptured by the Austrians in the 1716–18 war, and the fortress of New Orșova was built by Austrian colonel Nicolas Doxat. After a four-month siege in 1738 it became Ottoman again, followed by the Austrians re-conquering it in 1789, but they had to return the island with the Treaty of Sistova, which ended the 1787–91 war between the Ottoman Empire and the Habsburg Monarchy. Thereafter, the island lost its military importance. In 1804, during the First Serbian Uprising, Serbian rebels, led by Milenko Stojković, caught and executed the Dahije that had fled Belgrade and taken refuge on the island, thereby ending Dahije tyranny. Even though the Ottomans lost the areas surrounding the island after the Russo-Turkish War the island was totally forgotten during the peace talks at the Congress of Berlin in 1878, which allowed it to remain a de jure Ottoman territory and the Ottoman sultan's private possession until the Treaty of Lausanne in 1923. Between 1878 and 1918 the areas surrounding the island were controlled by Austria-Hungary to the north and Serbia to the south, but the island was under Ottoman sovereignty. The Ottoman Government continued to appoint and send a nahiye müdürü and a kadı regularly. The island's inhabitants enjoyed exemption from taxes and customs and were not subject to conscription. The islanders also had the right to vote during the Ottoman general elections of 1908.
On May 12, 1913, taking advantage of the Balkan Wars, dr. Zoltán Medve, the lord-lieutenant of Krassó-Szörény County sailed to the island under Austro-Hungarian ensign and introduced Hungarian administration by the representation of the Dual Monarchy. The island was transformed to a municipality became known as Újorsova assigned into the Orsova district of Krassó-Szörény County. This was the last territorial expansion of Hungary before the outbreak of the First World War; the seizure was never officially recognized by the Ottoman government. Following the end of World War I, Romania unilaterally declared its sovereignty in 1919 and strengthened its claim with the Treaty of Trianon in 1920. On July 24, 1923, the new Republic of Turkey officially ceded Ada Kaleh to Romania with Articles 25 and 26 of the Treaty of Lausanne; by formally recognizing the related provisions in the Treaty of Trianon. The population lived primarily on the cultivation of tobacco and fishery, and later on tourism. In its last years of existence, the island's population ranged between 600 and 1,000 inhabitants. Before the island was covered by the waters of the Iron Gates dam, part of the population moved to Constanța in Romania and the rest to Turkey, invited by Prime Minister Demirel during his visit to the island. The Ada Kaleh Mosque, dating from 1903, was built on the site of an earlier Franciscan monastery. The carpet of the mosque, a gift from the Turkish Sultan Abdülhamid II, was relocated to the Constanţa Mosque in 1965. The island was visited by King Carol II of Romania in 1931, and by Prime Minister Süleyman Demirel of Turkey on September 13, 1967.
Aftermath
During the construction of the dam, some of the structures that were built on the island were relocated to the nearby Şimian Island, including part of the masonry of the fortress' catacombs, the mosque, the bazaar, Mahmut Pasha's house, the graveyard and various other objects. However, the Ada Kaleh community decided to emigrate to Turkey after the evacuation of the island, instead of re-settling on Șimian Island. Also, a smaller part went to Dobruja, another Romanian territory with a Turkish minority, so the reconstruction of the "New Ada Kaleh" was never completed.
Literature
Ada Kaleh plays an important part in the novel of one of the most famous Hungarian authors, Mór Jókai. In the novel The Golden Man, published in 1872, Ada Kaleh is called the "No One's Isle" and it becomes an almost mythical symbol of peace, seclusion and beauty, juxtaposed with the material outside world. In Between the Woods and the Water, the second volume of Patrick Leigh Fermor's narrative of his journey across Europe, the author describes a delightful visit in 1934 with a group of elderly inhabitants and discusses the history of the island.
