During the Thirty Years' War the city had been under the control of the Dutch Republic, which in 1647 had given Johann Moritz von Nassau-Siegen administrative control over the city. He approved a renovation of Schwanenburg Castle in the baroque style and commissioned the construction of extensive gardens that greatly influenced European landscape design. Significant amounts of his original plan for Kleve were put into effect and have been maintained to the present, a particularly well-loved example of which is the "Forstgarten" (Forest Garden). In 1701, Cleves became part of the Kingdom of Prussia.