Jan Stanisław Sapieha
Jan Stanisław Sapieha (Lithuanian: Jonas Stanislovas Sapiega) (b. 25 October 1589, d. 10 April 1635 in Lachowicze) was a Polish-Lithuanian noble, starost of Słonim, Court Marshal of Lithuania from 1617, Great Lithuanian Marshal from 1621.
He was the son of Lew Sapieha. Jan studied abroad. He was a friend and supporter of prince and later king Władysław IV Waza and served as a deputy to many Sejms, and took part in the Polish-Swedish wars, but gained a reputation as a weak tactician, suffering several defeats. Near the end of his life he had mental health problems, but his friend the king allowed him to remain at the royal court till his last days.