From 1766 he was responsible for the Poniatowski's correspondence with the East. He was elevated to the rank of nobility (through Indygenat) by the Repnin Sejm. He acted as Poniatowski spy in on the Bar Confederation. In 1774 he took part in diplomatic mission to St. Petersburg (together with Franciszek Ksawery Branicki). From 1775 he was officially employed in the Department of Foreign Interests of the Permanent Council. In 1776 he received the noble name Lasopolski, the Order of Saint Stanislaus and the court rank of Chamberlain. He served as the Polish ambassador in the Ottoman Empire.