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.
|Short description||Polish noble|
|Date of birth|
|Place of birth|
|Date of death||April 9, 1731|
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