Background
Born in 1588 into the Ossoliński family of nobles, he was the third son of Jana Zbigniewa (1555–1623) (Member of Parliament, Speaker of the Sejm (1601)) and Matką Maksymiliana.
Born in 1588 into the Ossoliński family of nobles, he was the third son of Jana Zbigniewa (1555–1623) (Member of Parliament, Speaker of the Sejm (1601)) and Matką Maksymiliana.
He studied with his brother Jerzy with the Jesuits in Lublin in 1596, and then at universities in Western Europe.
He was Chamberlain of Sandomierz (1633), Treasurer of the Crown Court (1636–1648), Castellan of Czersk (1648) and Starost of Bieck and Malbork. He visited Italy and the Netherlands. Upon his return to Poland in 1607 he was courtier to Marcin Szyszkowski, and later was a royal courtier.
In 1618, he began his long career as a deputy of the province of Sandomierz.
His military career saw him participate in the Battle of Chocim, where he led his own division. He participated in the expedition against Russia"s invasion of Smolensk (the Smolensk War).