GRUDZIADZ (Ger. Graudenz), a town of Poland in the province of Pomorze, on the right bank of the Vistula near the Prussian frontier. Pop. It was formerly an im portant German fortress. It possesses three Roman Catholic and two Protestant churches, and a synagogue. It was founded by the Teutonic knights in the 13th century, and came under the rule of Poland by the Peace of Thorn in 1466. In 1772 it was seized by Prussia at the first partition of Poland.