Commander of the fluit Graaf Willem, later in 1653

Captain Jan Coenders commanded the hired fluit Graaf Willem in the Battle of the Gabbard. He was judged to be too inexperienced in war for further service. His luitenant, lt-cdr Hessel Gerritsz Bertson, is mentioned in a retrospective list from 22 November 1653 as commander. The Graaf Willem was a large 26-gun ship hired by the Admiralty of Friesland.