substantial success, and subsequently were forced to retreat. By 1739, entire territory of the Habsburg Kingdom of Serbia was lost to Ottomans. During the war, large portion of the Christian population from the region of Raška and other Serbian lands migrated towards the north, following the retreat of Habsburg armies and the Serbian Militia. They settled mainly in Syrmia and neighbouring regions, within the borders of the Habsburg monarchy. Among them were also the Catholic Albanian tribe Klimente, which settled in three villages in Syrmia. Number of migrants Sources provide different data regarding the number of people in the first migration, referring to the group led by Patriarch Arsenije III: According to Noel Malcolm, two statements from Arsenije survive. In 1690 he wrote "more than 30,000 souls", and six years later he wrote that it was "more than 40,000 souls". Malcolm also cites Cardinal Leopold Karl von Kollonitsch's statement from 1703 of more than 60,000 people led by the Patriarch from Belgrade to the Kingdom of Hungary, a figure Malcolm claims Kollonich may have been inclined to exaggerate. According to Noel Malcolm, data that state that 37,000 families participated in this migration derive from a single source: a Serbian monastic chronicle which was written many years after the event and contains several other errors. 37,000 families into Habsburg Monarchy, according to a manuscript at Šišatovac monastery written by monk Stefan of Ravanica 28 years after the first wave. 37,000 families, according to a book by Pavle Julinac, printed in 1765. 37,000 families led by the Patriarch, according to Jovan Rajić, published in 1794–95. 37,000 families led by the Patriarch, according to Johann Engel, published 1801. Mikael Antolović studied articles by Ilarion Ruvarac who claimed that between 70,000 and 80,000 refugees left Kosovo during the migration, while the Serbian public claimed that it was more than half a million, and that the majority fled due to "fear of Ottoman vengeance". Émile Picot concluded that it was 35,000 to 40,000 families, between 400,000 and 500,000 people. "It is a constant tradition that this population is counted by families, not by heads" also insisting that these were large extended families (see Zadruga). The Serbian Academy of Arts and Sciences, supports the figure of 37,000 families. Tatjana Popović, cites as many as 60,000 Serbian migrant families for the First Serbian migration alone. At least 30,000 people, according to Stevan K. Pavlowitch. 20,000–30,000 people, according