Hire a Hero
Quite often, none of the descendants of your dynasty are old enough to run your castles. In such a case you may use the tavern. There at the price of 200 Credits you can get trained hero, that you can assign to your castles. The hero you get will start at level 10.
Please note that when choosing a hero type at the Tavern, you can only choose a type of hero that you don't already own.
Example:
If you have a hero that is a Marshal, you will not be able to get a Marshal from the Tavern.