|Coat of arms||Piława|
with Wiktoria Leszczyńska
May 19, 1751|
Józef was considered as the richest magnate in Poland at that time. He was Voivode of Kijów Voivodship from 1702 to 1744, Regimentarz generalny of the Crown Army since 1733, Great Crown Hetman since 1735, voivod of Poznań Voivodship since 1743, castellan of Kraków since 1748 and starost of Halicz, Warsaw, Leżajsk, Kołomyja, Czerwonogród, Śniatyn and Bolemów.
In 1703 he suppressed a peasant revolt led by Semen Paliy in Ukraine. He was originally a supporter of King August II of Poland but in 1705 he changed sides and became a supporter of King Stanisław I Leszczyński.
Józef was defeated at the battles of Kalisz 1706 and Koniecpol in 1708 and since 1709 after the Battle of Poltava he lived in exile in Hungary and Turkey. In 1714 he came back to Poland and became together with Teodor Potocki, the leader of the opposition to the "Familia" and the royal court. As part of this opposition, he contributed to the breaking-up of 9 sejms and prevented an increase of the army.
In 1733 during the War of the Polish Succession he again supported Stanisław I Leszczyński. He became a regimentarz of the Confederation of Dzików and guided the Polish confederate army against Russian and Saxon forces in several battles. On 28 February 1735 he recognized August III as King of Poland, becoming the Grand Hetman of the Crown, but conspired against him and the royal court with Turkey, Sweden and Prussia.