planted bombs in several buildings in Thessaloniki, including the Ottoman Bank, with some assistance from the IMRO. The Greek consulate in Ottoman Thessaloniki (now the Museum of the Macedonian Struggle) served as the centre of operations for the Greek guerillas. During this period, and since the 16th century, Thessaloniki's Jewish element was the most dominant; it was the only city in Europe where the Jews were a majority of the total population. The city was ethnically diverse and cosmopolitan. In 1890, its population had risen to 118,000, 47% of which were Jews, followed by Turks (22%), Greeks (14%), Bulgarians (8%), Roma (2%), and others (7%). By 1913, the ethnic composition of the city had changed so that the population stood at 157,889, with Jews at 39%, followed again by Turks (29%), Greeks (25%), Bulgarians (4%), Roma (2%), and others at 1%. Many varied religions were practiced and many languages spoken, including Judeo-Spanish, a dialect of Spanish spoken by the city's Jews. Thessaloniki was also the centre of activities of the Young Turks, a political reform movement, which goal was to replace the Ottoman Empire's absolute monarchy with a constitutional government. The Young Turks started out as an underground movement, until finally in 1908, they started the Young Turk Revolution from the city of Thessaloniki, which lead to of them gaining control over the Ottoman Empire and put an end to the Ottoman sultans power. Eleftherias (Liberty) Square, where the Young Turks gathered at the outbreak of the revolution, is named after the event. Turkey's first president Mustafa Kemal Atatürk, who was born and raised in Thessaloniki, was a member of the Young Turks in his soldier days and also partook in the Young Turk Revolution. As the First Balkan War broke out, Greece declared war on the Ottoman Empire and expanded its borders. When Eleftherios Venizelos, Prime Minister at the time, was asked if the Greek army should move towards Thessaloniki or Monastir (now Bitola, Republic of North Macedonia), Venizelos replied "" (Thessaloniki, at all costs!). As both Greece and Bulgaria wanted Thessaloniki, the Ottoman garrison of the city entered negotiations with both armies. On 8 November 1912 (26 October Old Style), the feast day of the city's patron saint, Saint Demetrius, the Greek Army accepted the surrender of the Ottoman garrison at Thessaloniki. The Bulgarian army arrived one day after the surrender of the city to Greece and Tahsin