HEILSBERG, a town in the province of East Prussia, at the junction of the Simser and Alle, 38 m. S. of Konigsberg. Pop. It has an old castle, founded by the Teutonic order in 124o, which was from 13o6-c. 1800 the seat of the bishops of Ermeland. In 1807 the French fought the Russians and Prussians nearby. The principal industries are tanning, dyeing and brewing, and there is considerable trade in grain.