Orphaned at the age of seven , Wiśniowiecki was raised by his uncle , Konstanty Wiśniowiecki , whose branch of the family was Roman Catholics . Jeremi attended a Jesuit college in Lwów and later , in 1629 , he traveled to Italy , where he briefly attended the University of Bologna . He also acquired some military experience in the Netherlands . The upbringing by his uncle and the trips abroad polonized him , and turned him from a provincial Ruthenian princeling into one of the youngest magnates of the Polish @-@ Lithuanian Commonwealth .