missionary duties in Zagreb, where he taught at the Zagreb Theological Seminary as well as serving as a priest in several neighboring towns. Time in Russia Križanić managed to secure permission from the papacy for a brief visit to Moscow from 25 October to 19 December 1647 as part of a Polish embassy. However, he was not able to secure permission for a prolonged stay in the Tsardom of Russia until 1658 (permission was retracted shortly after being issued, a fact that Križanić simply ignored) and he did not arrive in Moscow until 17 September 1659. One author writes that he pretended to be an Orthodox Serb. He was assigned the duty of translating Latin and Greek documents and of preparing an improved Slavic grammar. However, he was exiled to Siberia on 20 January 1661. The reason for his exile remains unknown. Possible explanations put forward have included the fact that he was a Roman Catholic priest, his criticism of Russian society and of the Greeks, with whom Patriarch Nikon of Moscow (in office: 1652-1666) was attempting reconciliation, and other political and social motives. Križanić postulated that he was exiled because of "some foolish thing" he had said to someone, and that whatever he had said had been mentioned to the authorities. After having lived roughly a year and a half in the Russian capital, Križanić arrived in Tobolsk in Siberia, on 8 March 1661. He lived there for 15 years, surviving on a state stipend and working on the treatises On Divine Providence, On Politics, and On Interpretation of Historic Prognostications, amongst others. In these books, written in his self-devised "Common Slavonic language" (a Pan-Slavonic grammar named Grammatitchno Iskaziniye that incorporated numerous Slavic languages), he set forth a comprehensive program of reforms proposed for the Russian state, including reforms to administration, Russian serfdom, economic policy, education, grammar, and Russia's primitive agricultural system. Many of the reforms he recommended were in fact carried out by Peter the Great (), although there is no concrete evidence of Križanić's direct influence in his doing so. Križanić's Politika which he wrote between 1663 and 1666, was published by Peter Bezsonov (Russia in the Seventeenth Century, 1859–60) and for the first time in English in 1985, and is his most well-known and influential work. His appeal to the Tsar to head the Slavs in the fight against the Germans shows a remarkable political foresight.