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Jan III Sobieski was born at Olesko Castle, situated in what was then the Ruthenian Voivodeship (now Ukraine). He came from a magnate family, and his upbringing at the family estate in Żółkiew was steeped in the memory of his ancestors’ military successes, including those of his great-grandfather Stanisław Żółkiewski. He received a thorough education at the Nowodworski Collegium and the University of Kraków, after which he and his brother undertook a long journey through Western Europe. There, he studied the art of war, foreign languages and the political realities of foreign courts, which prepared him to take on public duties.
His return to the country coincided with a national crisis. He gained his first combat experience at the Battle of Berestechko, where he was seriously wounded. During the Swedish Deluge, he initially abandoned King John II Casimir in favour of the invaders, but after a few months he returned to his loyalty to the Polish Crown. At the same time, at the royal court, he met the French court lady Maria Kazimiera d’Arquien, known as Marysieńka. His deep feelings for her, culminating in their marriage following the death of her first husband, bound him permanently to the pro-French faction.
On his return to Poland, Jan Sobieski regularly commanded troops in battles against the Russians and the Cossacks. In 1666, he became Crown Field Hetman, and two years later he assumed the office of Grand Crown Hetman. Following the election of Michał Korybut Wiśniowiecki as king, he led the opposition, strongly supported in this by his ambitious wife, who sought to strengthen her husband’s political position. Despite internal tensions, he continued to enjoy success as a military commander. The decisive moment proved to be the victory over the Turkish army at Chocim in 1673, achieved shortly before the monarch’s death. This triumph paved the way for Sobieski to ascend the throne of the Polish-Lithuanian Commonwealth, and Marysieńka was crowned queen. The most significant military success of his reign was the Battle of Vienna, after which he sent his wife the famous letter beginning with the words ‘Venimus, vidimus, Deus vicit’. Despite subsequent successes in the war against the Ottoman Empire, his foreign policy and plans regarding Moldavia did not yield the expected results. Nor did he manage to achieve one of his most important political objectives – securing the succession to the throne for his son Jakub.
In the final years of his life, the king struggled with worsening health problems, which the court physicians were unable to treat. He died after a long illness. His body was laid to rest at Wawel, whilst his heart was interred in the Capuchin church in Warsaw, built as a votive offering to celebrate the victory at Vienna.
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