Jan Szembek
 |
Jan Sebastian Szembek | |
|---|---|
| Count | |
 Portrait attributed to Ádám Mányoki | |
| Coat of arms | Szembek |
| Full name | Jan Sebastian Szembek |
| Died | April 9, 1731 |
| Family | Szembek |
| Consort | Ewa Leszczyńska |
| Issue | Bihilda Szembek |
Count Jan Sebastian Szembek (?-1731) was a Polish szlachcic.
Recorder of the Crown since 1699, Deputy Chancellor of the Crown in 1703-1711, Grand Chancellor of the Crown since 1712. Starost of Łomża
Marshal of the Sejm (zwyczajnego) on December 22, 1701 - February 6, 1702.
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