Fredrikstad is a city in the south-east of Norway. At the 2012 census, it had a population of 75,583, making it the sixth largest in Norway. Fredrikstad was founded in 1567 by the Danish king Frederik II. The biggest historical monument is the fortifications of the old town. Norway’s longest river Glomma flows through the city. It used to be a port, but today it is dominated by the chemical industry.