Originally, there was a large forest northwest of Zaventem called "Saventerlo" where the Dukes of Brabant used to go hunting. The area was largely deforested in the 17th century. Nevertheless, Zaventem remained predominantly agricultural during the most part of the nineteenth century but its industrial activities go at least back to the 13th century. During this time, various water mills were installed on the Woluwe River that were later converted to paper mills. Initially, the river had many bends along its path in Zaventem which made the supply of energy from the water power rather difficult. In 1208, Godfrey, Duke of Brabant gave orders to alter and elevate the pathway of the Woluwe River so that the watermills would be supplied with a sufficient amount of water. This greatly benefited the paper industry later on in the 18th and 19th century.