Fredrick Stellingwerff About all we know about Fredrik Stellingwerff is that he served the Admiralty of Friesland at the Battle of Scheveningen. As I mentioned previously, his ship was the Zevenwolden. The Zevenwolden was captured at Scheveningen and sunk. Captain Stellingwerff went into captivity in England, where he died of disease, not that long after his capture.