He contributed to the conversion to Roman Catholicism of count Otto Magnus von Stackelberg and prince Demetrius Augustine Gallitzin.
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In June 1810 he accompanied Jakob Linkh (1786–1841), Peter Oluf Brøndsted (1780-1842), Otto Magnus von Stackelberg (1787–1837) and Georg Koës (1782-1811) to Athens, via Naples, Corfu and Corinth.
Working together, in an unlikely alliance between the Roman Catholic Church and Orthodox Russia, papal nuncio Giovanni Andrea Archetti and Russian ambassador Otto Magnus von Stackelberg jointly bribed deputies to the Polish Sejm in exchange for their opposition to the Code.