Jan Gniński (died c.1685) was a diplomat for the Polish–Lithuanian Commonwealth, Treasurer of the Crown Court.
He was Vice-Chancellor of the Crown from 1681, voivode of Malbork in 1681, governor from 1668 to 1680 of Chelm[1] and was an MP in the Sejm.
He participated in the Polish-Swedish wars and the Siege of Vienna (1683) and was known to be an Ambassador to Turkey.
[2] Jan Gniński was married to Dorota Jaskólska.
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