I have been reading the Onstelde-Zee (1654) pages about the Battle of Portland (with some difficulty). Now, I have open my copy of Schetsen uit de Geschiedenis van ons Zeewezen. I am looking at the Dutch ship losses and captains killed.
Rotterdam captains killed:
Amsterdam captains killed:
Noorderkwartier captain killed:
Zeeland captains killed:
East India Company captain killed:
In addition to this list, which is from Jan Evertsen's journal, we know that the Friesland ship, Frisia, commanded by Schelte Wichelma, blew up, and he was almost certainly killed.