 Complete the following phrase:  The Greek revolt of 15661572 was a series of conflicts between Greek rebels and the Ottoman Empire during the early period of Ottoman rule in the region. Social tensions intensified at the end of the 16th century by the debilitation of the Ottoman administration, the chronic economic crisis, and arbitrary conduct of the Ottoman state authorities. The leaders of the uprising were initially successful and controlled several strategic locations and fortresses, especially in Epirus, Central Greece, and the Peloponnese. However the movement lacked the necessary organization. They were assisted by western powers; mainly by the Republic of Venice. Meanwhile the victory of the Holy League against the Ottoman fleet in the 