[Königsberg] The Propsteikirche (German for `provost church`), also known as the Katholische Kirche (Catholic church), was a Roman Catholic church in the Sackheim quarter of Königsberg, Germany. Its patron saint was John the Baptist. ==History== As part of his investiture as Duke of Prussia in Warsaw in 1611, Elector John Sigismund agreed... Found on http://en.wikipedia.org/wiki/Propsteikirche_(Königsberg)