Kingdom Leader is Inactive

If your Kingdom Leader is inactive for at least 30 days, the highest-ranking active members are able to demote the Kingdom Leader and promote themselves to Leader.

There can only one Kingdom leader, should they be inactive for 30 days then the next highest ranking player in the Kingdom can demote that leader and promote themselves. 

TIP: Inactive Kingdom members will have "Zzz" in their chat card in the Kingdom Roster. If they have been inactive for a year, then it will display a dinosaur fossil.

Removing an inactive Kingdom Leader

To demote, promote or kick someone from the Kingdom, select the inactive player's name. On the menu that appears, select the action you'd like to take.
Only the next in command is able to demote a Kingdom leader.

In the example below, you can see the player can now be demoted to Duchess from Queen.

Now that you've changed your Kingdom Leader, you can find information on how to Manage your Kingdom in this article here.