Son of Józef Sołtyk, castellan of Lublin and court marshal to primate of Poland, Teodor Potocki, and Konstancja z Drzewickich, brother of Tomasz Sołtyk and Maciej Sołtyk, scion of the great Saltykov family of Russia, he was educated by Jesuits and took Holy Orders in 1732. From 1735 to 1738 he studied in Rome. After his father died, saddling the family with debt, he was unable to afford to return to Poland until 1740, when he attached himself to the court of bishop of KrakówJan Lipski. Since then he started becoming more and more active on the political scene. In 1753 he was involved in a blood libel process against Jews, which resulted in 13 of them being sentenced to death. As a politician he was known to use unethical means - from nepotism through forgery of documents to bribing the localszlachta at sejmiks. During the reign of Augustus III of Poland, known to be the height of political corruption and anarchy in the Polish-Lithuanian Commonwealth, he became one of the most important politicians at the royal court, working closely with the de facto ruler of Poland, Count Heinrich von Brühl. In 1756 he became the bishop of Kiev. However, from the early 1760s due to various conflicts he distanced himself from Brühl. After the death of Augustus III Sołtyk initially opposed the election of Stanisław August Poniatowski, although later, partially due to his worsening health, he somewhat distanced himself from politics. He became deeply involved in politics again as the Russian Empire ambassador Nicholas Repnin started fomenting unrest in the Commonwealth by encouraging the Protestants and the Orthodox to demand position equal to that of the Catholics. One of Sołtyk's main goals then became to dethrone King Poniatowski. In the shifting world of political alliances, for a time he worked with pro-Russian factions, but eventually became an opponent of Repnin. During the Repnin Sejm in 1767, Sołtyk opposed the practical dictatorship of Repnin, and for this opposition he was arrested and imprisoned in Kaluga, along with three other Polish senators. Sołtyk was a vocal opponent of giving non-Catholics equality with Catholics, and he issued a manifest calling for prayers for preservation of the faith and national freedoms. In 1781, when he returned from the imprisonment, his increasingly erratic behaviour allowed his opponents to declare him insane by the Permanent Council and King Stanisław August. A special commission was tasked with investigating his situation. The problem caused much controversy, as it was alleged that the investigators were influenced by various political motivations. The Sejm of 1782 was heavily preoccupied with this case. One of the primary issues was the relevance of the neminem captivabimus law, which had no provisions for mentally ill persons, and which guaranteed wide personal freedoms to Polish nobility. Amendment bills were submitted, but were met with opposition and filibusterer, preventing the Sejm from making much progress on any issues. Eventually, Sołtyk failed to reclaim his bishopric from the substitutes who administered it in his absence. Thus for the last years of his life his political influence and power significantly waned.
