John III Sobieski was born on August 17, 1629, in Olesko, now Ukraine, then part of the Ruthenian Voivodeship in the Crown of the Kingdom of Poland, Polish-Lithuanian Commonwealth to a notable but less known noble family de Sobyeszyn Sobies, which belonged to the Janina clan. His ancestors were of lesser nobility. His father was Jakub Sobieski and his mother Sobieski's mother was Zofia Teofillia Daniłowicz. She was the granddaughter of high-rank military commander Stanisław Żółkiewski. When John III Sobieski was born, his father had already became an officer of higher rank and had an office at the royal court. At the end of life, John III Sobieski's father, Jakub, became the castellan of the city of Kraków. His position as a castellan made him a member of the Polish Senate.
John III Sobieski spent the most of his life growing up in Żółkiew. After he graduated from college, they decided to travel all the Western Europe. He and his brother, Marek Sobieski, were traveling through the Western Europe for two years long. The Sobieski noble brother visited along their journey cities such as Leipzig, Antwerpen, Paris, London, Leiden, The Hague, Amsterdam and many other cities. Along his journey, important things happened, John III Sobieski and his brother Marek met many important figures of those days such as Louis II de Bourbon, Charles II of England and William II Prince of Orange.