or Fredericksall, a maritime town of Norway, stiff of Aggerhus, at the influx of the Tistedelf into the Ideford, 57 miles S.S.E. of Christania. It is noted for its strong castle of Frederickstein, which stands on a perpendicular rock 350 feet high overhanging the sea, and is considered one of the strongest fortresses in Europe. It was at the siege of this fortress that Charles XII., king of Sweden, was killed on 11th December 1718. The town itself is not walled. It was almost totally destroyed by fire in 1759, and has since been rebuilt in a neat and regular manner. Pop. 4000.