In the late eighteenth century, an increase in secular learning during the Modern Greek Enlightenment led to the revival among Greeks of the diaspora of the notion of a Greek nation tracing its existence to ancient Greece, distinct from the other Orthodox peoples, and having a right to political autonomy. One of the organizations formed in this intellectual milieu was the Filiki Eteria, a secret organization formed by merchants in Odessa in 1814. Appropriating a long-standing tradition of Orthodox messianic prophecy aspiring to the resurrection of the eastern Roman empire and creating the impression they had the backing of Tsarist Russia, they managed amidst a crisis of Ottoman trade, from 1815 onwards, to engage traditional strata of the Greek Orthodox world in their liberal nationalist cause. The Filiki Eteria planned to launch revolution in the Peloponnese, the Danubian Principalities and Constantinople. The first of these revolts began on 6 March 1821 in the Danubian Principalities under the leadership of Alexandros Ypsilantis, but it was soon put down by the Ottomans. The events in the north spurred the Greeks of the Peloponnese into action and on 17 March 1821 the Maniots declared war on the Ottomans.