Marek Sobieski (24 May 1628 – 3 June 1652) was a Polish nobleman, starosta (tenant of the Crown lands) of Krasnystaw and Jaworów, and the older brother of King John III Sobieski of Poland. He graduated from Nowodworek College in Kraków and Kraków Academy, then traveled and studied in Western Europe. After returning to Poland in 1648 he fought against the Cossacks and Tatars at the Siege of Zbaraż and at the Battle of Beresteczko. He was taken captive by Tatars in 1652 and then killed by Cossacks.
Childhood and studies
Sobieski was the oldest child of Jakub Sobieski and his second wife Teofila Zofia Daniłłowicz. He was born on 24 May 1628 in Zolochiv and spent his childhood in Zhovkva. He grew up in a patriotic family, and his mother often took him and his brother to the grave of her grandfather Stanisław Żółkiewski, Grand Hetman of the Crown, who was killed in the battle of Cecora in 1620. Zofia Teofila Daniłłowicz taught her sons the inscription upon their great-grandfather's grave: "O quam dulce et decorum est pro patria mori!" (How sweet and glorious it is to die for one's homeland!). On 29 October 1639 Sobieski became Starosta of Yavoriv.
Along with his brother John, beginning in 1640, Sobieski studied at the Nowodworski College in Kraków. On 29 April 1642 Sobieski made a speech on funeral of Jakub Zadzik, bishop of Kraków. Two months earlier, in April 1643, Marek and John Sobieski began studies at Kraków Academy. In 1644 Sobieski became Starosta of Krasnystaw. Jakub Sobieski, who was inspired by Roman authors, emphasized learning foreign languages and physical exercises. He wanted to prepare his sons to be politicians and diplomats.
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 The brothers had planned to go to Turkey, but after hearing of the Khmelnytsky uprising they decided to return to Poland.
Adulthood
After returning to Poland, Sobieski and his brother came to Zamość, which at the time was being besieged by Cossacks. In 1648, 1649 and 1650 Sobieski was elected a member of the parliament (sejm walny) of the Polish–Lithuanian Commonwealth. In 1649 he was among the electors who voted for John II Casimir as King of Poland. In 1650 he fought against the Cossacks at Kamieniec Podilskiy. In September 1651 he fought at the Battle of Biała Cerkiew. When the Poles, Cossacks and Tatars began negotiations, Marek Sobieski was sent to the Cossack camp as a guarantor of safety for the Cossack leader, Bohdan Khmelnytsky, who was in the Polish camp. After the battle, the Cossacks paid the Tatars for possession of the prisoners, and killed the Polish captives in retaliation for Chmielnicki's defeat at Berestechko. Among the 8,000 massacred Polish soldiers was Marek Sobieski. or the number could have been much higher, up to 15,000 killed in action and massacred.
Sobieski's mother returned his body home, His brother, King John III Sobieski, commissioned a gravestone by Andreas Schlüter, which is now in Zhovka. In 1946 Sobieski's body was taken to the Dominican Holy Trinity Church in Kraków.