Jan Jakub Zamoyski
Jan Jakub Graf Zamoyski was a Polish nobleman. He was the brother-in-law of king Stanisław August Poniatowski.
Jan became the 9th Ordynat of Zamość estate in or until 1780. He was voivode of Podole Voivodeship in 1770 and starost of Lublin. He was awarded the Knight of the Order of the White Eagle on 8 May 1768.
Jan married in 1745 Ludwika Maria Poniatowska, by whom she had one child, the daughter Urszula Zamoyska.