Count Jan Sebastian Szembek (1672-1731) was a Polish szlachcic.
He was Recorder of the Crown starting in 1699, Vice-Chancellor of the Crown in 1702, and Grand Chancellor of the Crown since 1712. He was also the starost of à Âomà ¼a in 1706.
Marshal of the Sejm (') on December 22, 1701 - February 6, 1702.
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