The House of Sinzendorf (also: Sinzendorff) was a Bavarian-Austrian noble family with Upper Austrian origin (Sinzendorf in Nußbach), not to be confused with the Lower Austrian House of Zinzendorf. The family belonged to prestigious circle of high nobility families, but died out in 1822 in the male line. History The Sinzendorf family appear in the 13th century as Ministerialis of the Kremsmünster Abbey. The ancestral castle was Sinzendorf in the municipality Nußbach in Traunviertel. From 1404 to 1566 they owned Castle Feyregg, from 1497 to 1708 Castle Fridau was owned by the family. Around 1450, the family split into two lines (later referred to as Ernstbrunn-Feyregg and Fridau - Neuburg). In 1592 Joachim von Sinzendorf bought the castle and the reign of Ernstbrunn (with Klement Castle and Michelstetten Castle) and considerably expanded the Ernstbrunn Palace. In 1610 the nobles of Sinzendorf were raised to the baron, 1653 in the Imperial Count. 1653 bought Rudolf von Sinzendorf from Ernstbrunn the castle county Rheineck am Rhein, thus his line was part of the Kuriatstimme the Westphalian Grafenbank in the Imperial Imperial Council and rose to the imperial high nobility on. In the second half of the 17th century, Georg Ludwig Graf von Sinzendorf bought the county of Neuburg am Inn, which was lost in 1680 again. 1654 Count Georg Ludwig von Sinzendorf from the Fridau-Neuburger line is invested with the hereditary treasury of the Roman-German Emperor; as a sign, he was allowed to record the imperial crown in his coat of arms. In 1677, he also acquired a realm- rich position: As the owner of the rule Thannhausen (Swabia), he became a member of the Swabian Imperial College, until 1708 this rule was sold by his descendants to the Counts of Stadion. The line Neuburg am Inn is extinct in 1767. The line Ernst Brunn divided into the Majoratslinie and into the younger one. For the former, raised in 1803 in the imperial princely state, included the dominions Ernst Brunn, Klement, Straussberg, Triebel, Castle Eichhorn (from 1707-1802), inter alia, in Austria, Bohemia and Moravia, and the castle county Winterrieden in Bavaria, which the family instead of the lost County Rheineck was given. With Prosper of Sinzendorf on Ernstbrunn (1751-1822), raised to the rank of sovereign imperial prince in 1803, but mediatized to Bavaria in 1806. With the death of Prince Prosper the family died in 1822 in the male line. It was