German mediatization
Karl Rudolf Graf von Buol-Schauenstein (30 June 1760 – 23 October 1833) was Bishop of Chur (1794–1824), then of Chur-St. Gallen (1824-1833). He had also been the last prince-bishop of the Prince-Bishopric of Chur until the ecclesiastical principality was secularized in 1803 in the course of the German mediatization.