Context : On his second trip to the East, for a different company, Cornelis de Houtman and his troops got into a confrontation in Aceh, because of his rude temperament, and soon there were fierce battles with the Acehnese Navy, led by Aceh's female admiral, Keumalahayati (Malahayati) who eventually managed to kill Cornelis de Houtman. 
Subject : Cornelis de Houtman 
Relation : occupation
What was Cornelis de Houtman's occupation?