 In 1798, however, he was forced to abandon his birthplace, due to Ali Pasha's hostility towards him, and fled to Serbia, where he collaborated for some time with Karađorđe Petrović during the First Serbian Uprising (he is known in Serbia as Kapetan Jorgać, "Captain Giorgakis").Olympios became a supporter of the ideas diffused by Rigas Feraios for a common Balkan revolution against the Ottoman rule, and moved to Wallachia.There, with the help of Constantine Ypsilantis, he composed a military force of Greeks to fight alongside the Russian Empire in the Russo-Turkish War of 1806.