Background
He was the son of castellan and voivode Marek Sobieski and Jadwiga Snopkowska.
He was the son of castellan and voivode Marek Sobieski and Jadwiga Snopkowska.
Sobieski was educated in Krakow and Paris.
He was a famed orator and parliamentarian. He took part in negotiations with Muscovy in the Truce of Deulino in 1618. Subsequently he fought in the Chocim expedition against the Ottoman Empire in 1621, and the expedition against Abazy Pasa in 1633.
He was one of the negotiations with Sweden in the Treaty of Stuhmsdorf (Sztumska Wieś) in 1635.
Official career He was courtier since 1617, Krajczy of the Crown since 1626, Podczaszy of the Crown since 1636, voivode of Belz Voivodship since 1638 and of Ruthenian Voivodship since 1641 and castellan of Krakow since 1646. Starost of Trembowla, Krasnystaw, Jaworów, Stryj, Kałusz, Bar and Gniewo.
Elected Deputy to seven Sejms between 1623 and 1632, as Sejm Marshal he led the ordinary Sejm in Warsaw on January 24 - March 5, 1623 and on January 27 - March 10, 1626, the extraordinary Sejm in Warsaw on June 27 - July 18, 1628 and the Election Sejm in Warsaw on September 24 - November 15, 1632. He was considered by his contemporaries a wise and honorable person.
In politics, he usually supported king"s plans, but was also a defender of the nobility rights and religious tolerance.
He participated in the military expedition (Dymitriads) against Russia in 1617-1618 (wounded during the assault of Moscow), and was a member of the War Council (Rada wojenna) of King Władysław IV. Member of many commissions and diplomatic bodies, he often acted as a mediator or as a guardian of orphaned children.