Gysius was born in Ostend, Belgium around 1583. He was married twice. His second wife was named Petronella Michiel Matthijsdr. The couple married in Dordrecht in South Holland on 8 August 1617. The couple had one daughter, named Sara. She was born in 1630 in Streefkerk. His work Oorsprong en voortgang der Nederlandtscher beroerten (Origin and progress of the disturbances in the Netherlands) about the Dutch Revolt. He died in 1652 in Streefkerk.
- Kranenborg, J.B. "Ancestors of Cornelis Leendert de Groot". Ninth Generation. Retrieved 25 August 2013.
- "Mirror of the Cruel and Horrible Spanish Tyranny Perpetrated in the Netherlands, by the Tyrant, the Duke of Alba, and Other Commanders of King Philip II". World Digital Library. 1620. Retrieved 2013-08-25.
|This article about a historian is a stub. You can help Wikipedia by expanding it.|