Jan Stanisław Jabłonowski

Jan Stanisław Jabłonowski of the Prus III coat of arms (1669 - 28 April 1731 in Lviv) was a Polish political writer who was a maternal uncle of Stanisław Leszczyński, under whom he served as Crown Chancellor in 1706-09. He also held the positions of Crown standard-holder from 1687, voivode of Volhynia since 1693, and also voivode of Ruthenia from 1697.
He was the son of Marianna Kazanowska and Stanisław Jan Jabłonowski. Through them he was the brother of Aleksander, Stanisław, Jadwiga, and Anna. Through Anna, he was the uncle of King Stanisław Leszczyński and grand-uncle of Queen Maria Leszczyńska.
Despite this family relationship, in 1704, he took part in the Confederation of Sandomierz which supported August II against his nephew. After August was dethroned, he was suggested as a possible candidate, but never put himself forward; as part of the Northern Wars, Stanisław Leszczyński was already supported by Karl XII. After this he went to Saxony, only switching his...