FRAUENBURG, a town of Germany, in the kingdom of Prussia, on the Frische Haff, at the mouth of the Bande, 41 m. S.W. from Königsberg on the railway to Elbing. Pop. 2500. The cathedral (founded 1329), with six towers, stands on a commanding eminence adjoining the town and surrounded by castellated walls and bastions. This is known as Dom-Frauenburg, and is the seat of the Roman Catholic bishop of Ermeland. Within the cathedral is a monument to the astronomer Copernicus bearing the inscription Astronomo celeberrimo, cujus nomen et gloria utrumque implevit orbem. There is a small port with inconsiderable trade. Frauenburg was founded in 1287 and received the rights of a town in 1310.