From lowest to highest, the ranks are:
- Chief Warlord
A Unit may be promoted from any lower rank to any higher rank. It is not possible to be promoted above Chief Warlord, since the ony position higher is Overlord, and that position requiries a vacancy, in which case other rules concerning barbarian status are involved.
A barbarian Warlord may claim a City and thereby become an Overlord, but this is not a promotion, because the Warlord is resposnible for his or her own rise in rank, and the position is not granted by a higher authority.
See Unit for more details.