Count 'Jan Sebastian Szembek’ (1672-1731) was a Polish szlachcic. Recorder of the Crown since 1699, Vice-Chancellor of the Crown in 1703–1711, Grand Chancellor of the Crown since 1712. Starost of Łomża Marshal of the Sejm () on December 22, 1701 - February 6, 1702. Further reading Listy Jana Jerzego Przebendowskiego podskarbiego wielkiego koronnego do Jana Szembeka podkanclerzego i kanclerza wielkiego koronnego z lat 1711-1728", ed. Adam Perłakowski, Kraków 2000. 1672 births 1731 deaths Counts of Poland Marshals of the Sejm of the Polish–Lithuanian Commonwealth Crown Vice-Chancellors