Dukedoms are areas of land across the Overworld that can be claimed by players. A player's reputation is increased by claiming a dukedom, which factors into rank.
Playing within a dukedom you control will grant you a buff that increases your stats by 5%. Playing within the dukedom set as your origin town will grant you a buff that increases your stats by 10%.
The duke collects a tax from traveler's battles that is added to the dukedom's weekly income and a portion of which is granted to the duke whenever night falls. The current location's dukedom's weekly income can be viewed from the Area menu.
How to Claim Dukedoms
If a dukedom has a blue crest (), it is unclaimed. A player can claim a dukedom by tapping its name and holding "Claim Area" in the area menu. Sometimes it is possible to view and claim nearby dukedoms as well, if your current location is near an area border. If a dukedom is claimed, the controlling player's portrait replaces this blue crest. If you control the current dukedom, then your grayed out portrait will be in the upper right along with a shield icon.
Players can challenge other Dukes for their territory through PvP combat. As of 1.14.0, dukedoms have a set amount of health. If the challenger wins in one attempt, they immediately gain control of the dukedom. If the challenger loses, they must wait an hour before they (or any other player) can challenge again. This allows low-level players to whittle away high-level player's dukedoms over time. There is currently no limit to the number of dukedoms players are allowed to control.
When another player challenges to claim a dukedom and wins, the previous Duke will be alerted of the player's name, the name of the dukedom, cardinal direction, and approximate distance from their current location. Dukedoms can be stolen back and forth indefinitely between players, however only once per hour. A history of your lost dukedoms can be found in the message log.
In the top left corner of the character screen, you can view a list of all your current dukedoms by clicking the crown icon ().
Each area has 3 indicators that affect how strong the duke will be when challenged. For each bar, if the cursor is on the right, the duke will be more powerful, and if the cursor is on the left, the duke will be less powerful. "Duke Influence" is determined by the number of nearby territories that duke owns, "Kingdom Influence" is determined by the number of nearby territories owned by that kingdom, "Faction Influence" is determined by the number of nearby territories owned by that faction.