and several wars during the reign of King Louis XIV of France resulted in worsening finances for Neuss. Its importance as a place for trading declined rapidly, and from the mid-17th century onwards, Neuss became a place only important for its agriculture.

Until the late 18th century, Neuss belonged to the Electorate of Cologne. From 1794 to 1814, Neuss was part of France during the reign of Napoleon. In 1815 after the Napoleonic Wars,