The settlement arose around a castle on a ford crossing the Saale and received municipal rights in 1185. During the Thirty Years' War, the town was badly damaged and the population fell from 2200 to 960. On 7 November 1632 the body of King Gustavus Adolphus of Sweden was first laid out at Weißenfels after he had been killed the day before at the Battle of Lützen.