Kasper Doenhoff

Prince Kasper Doenhoff (, , 1587–1645) was a Polish nobleman of Baltic-German extraction, a Reichsfürst of the Holy Roman Empire and Governor of Dorpat Province within the Polish–Lithuanian Commonwealth. Upon converting to Catholicism, he became a trusted courtier and advisor to Sigismund III of Poland. Early life Doenhoff was the son of Gerhard von Dönhoff (1554-1598) and his wife, Margaretha von Zweiffeln (1555-1622). He was the brother of Ernst Magnus von Dönhoff (Governor of Parnawa) (1581-1642), Hermann von Dönhoff (1591-1620) and Gerhard von Dönhoff, Governor of Pomorze (1590-1648) and Anna von Maydel (1585-1639). Titles He became titular Governor of Dorpat (1627–34) (although already in 1625 the town had capitulated to Sweden and was never reobtained by the Poles); from 1633, Count of the Holy Roman Empire (along with Ernst and Gerhard von Dönhoff); Governor of Sieradz (1634–45); Court Marshal of the Queen (from 1639); and starosta of Wieluń, Lauenburg (Lębork), Radomsko, Bolesławiec, Sokal, Małoszyce, Sobowidze and Klonowo. In the Holy Roman Empire, he was a noble (Reichsfürst); count (from 1635); prince (from 1637); and court marshal.