Gunterstein Castle (Dutch: Gunterstein) is a castle in Breukelen, on the river Vecht, that was the former home of the rich Dutch widow Magdalena Poulle (1626–1699). She bought the property and associated title after the former castle and stronghold was destroyed by the French in the Disaster Year Rampjaar 1672.
Johan van Oldenbarnevelt (Dutch pronunciation: [ˈjoːɦɑɱ vɑn ɔldə(m)ˈbɑrnəvɛlt]; 14 September 1547 – 13 May 1619), Heer van Berkel en Rodenrijs (1600), Gunterstein (1611) and Bakkum (1613), was a Dutch statesman and revolutionary who played an important role in the Dutch struggle for independence from Spain.
Van Oldenbarnevelt was born in Amersfoort. He studied law at the universities of Leuven, Bourges, Heidelberg, and Padua, and traveled in France and Italy before settling permanently in The Hague. He favored William the Silent in his revolt against Philip II of Spain, and fought in William's army. In his later years he was a supporter of the Arminians during the religious-political controversy which split the young Dutch Republic. He was the founder of the Dutch East India Company.