He is a leader that has the obligation to plan, carry out and run a business of conquest.
I believe that, Captain of conquest is a " 34 King; as a captain, but in this case the conquered the town, city, or country... thank you.
He is a captain who must collect all the money possible for financar expedition
He is a captain who commands and sometimes makes wars
It means that he is a captain in any war and which instructs all his army
It's like a leader who leads a troop to conquer a land