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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| Persondata | |
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| Name | Szembek, Jan |
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| Short description | Polish noble |
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| Date of death | April 9, 1731 |
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