ArmyMaster
Once you have your castle, this will be the meeting point of your servants. Here are all they: your general, your captaint, the troubadour, the realm raiser, the spy, the explorer, the slaves trader, your mentor, your messenger and your diplomatic.
From the warroom you can plan your defense and attacks.
At barracks you can research and train your units.
Your troubadour can sing you the battles.
Your spy can give you information about other kingdoms.
You can buy and sell units on slaves market.
At treasure room you can see the status of your economy, set tax and see the current state of the lands of the kingdom.