a statesman and soldier, who was stadtholder of Overijssel, Guelders and Utrecht for the States-General of the Netherlands during the Eighty Years' War. In 1585, the Spanish general Juan Baptista de Tassis defeated him and Maarten Schenk van Nydeggen at the Battle of Amerongen on 23 June 1585. Schenk would in the same year build the fortress of Schenkenschans (Schenk's fortress) on his orders. Nieuwenaar died in an explosion at Arnhem, while testing a new piece of artillery, on 18 October 1589.
