During the First Serbian Uprising (1804–15), the Serbian rebels were joined by Greeks and Greek-Aromanians, among others, with notable examples being fighter Giorgakis Olympios, diplomat Petar Ičko, secretary Naum Krnar, fighter Konda Bimbaša, and others. Greek "armatolos" Nikotsaras (d. 1807) planned to cross Mount Olympos to join the Serbian rebels. Military cooperation between the two nations was forged in the semi-autonomous Danubian Principalities, which were governed mostly by Phanariote Greek voivodes. There are indications that communication and cooperation between Serbs and Greeks of the Greek mainland had also been established early. For example, in 1806 the French consul in Thessaloniki reported that "the Turks are very furious against the Greeks because of their communications with the Serbs". It was reported that many Slav and Greek peasants were arrested suspected of aiding the Serbian rebels. The klephts and armatoloi were encouraged by the Serbian rebels and Russian actions. The Serbian rebels were important allies to the Greeks; after the suppression of the First Uprising, Karađorđe fled to Bessarabia, where he joined the Greek national liberation movement "Filiki Eteria", becoming an active member. The Greeks were primarily interested in using the Serbian lands as base of the Greek operations. Miloš Obrenović, the leader of the Second Serbian Uprising (1815–17) was fully uncooperative. The first historian of the Serbian Revolution was a Greek, Triantafillos Doukas. Many Serbs joined the Greek War of Independence (1821–29), such as Hadži-Prodan and Vasos Mavrovouniotis.