After completing their studies in 1646, the brothers started to travel around Europe under the tutelage of Sebastian Gawrecki. They departed Żółkiew on 21 February or 25 March 1646. They visited Berlin, Wittenberg, Leipzig, Halle, Amsterdam and Paris, where they arrived on 9 June 1646. They spent the next 16 months in France. In October 1647 Marek and John Sobieski went to England and subsequently studied mathematics in the Netherlands. The brothers had planned to go to Turkey, but after hearing of the Khmelnytsky uprising they decided to return to Poland. Marek and John Sobieski left Brussels on 24 July 1648.