John II Casimir Vasa
Sulejów used to be located on the trade routes between Silesia, Wielkopolska and the Kievan Rus'. In 1410 the Cistercian abbey was one of the stopping places for the Polish army, led by King Władysław II Jagiełło. Also Kings Casimir IV Jagiellon and John II Casimir Vasa and several papal legates visited the town.