Titles represent the land ownership and each place a character owns. These titles each have their own rank and unique coat of arms. Depending on the title and culture of the character holding the title, the title name can be changed. All titles can be renamed by the holder of the title.
There are five different ranks of land ownership. This will dictate how much power your character has, who your character has fealty to, and what De Jure, or by law, what titles underneath you do you have a claim over.
This is the lowest rank of all landed titles and is the only non-playable level in Crusader Kings 3. Baronies sometimes have a population and can have a holding
County is the second lowest rank of all landed titles and the lowest rank that is playable. A character who controls at least one County has the title of Count. The territory of the County will encompass multiple Baronies and cannot be altered.
Duchy is the third and middle level of landed titles. This is the first level that has its own map view and can be changed with the shortcut key “U”. All duchies in the game is considered to part of a specific De Jure kingdom. A character that owns one or more Duchy is either a titled a Duke or a Duchess.
Kingdom is the second highest of the landed titles behind Empire. A character that owns a Kingdom is either titled a king or queen. The borders of both Kingdoms and Empires will change over time as the game progresses. A duchy will assimilate into a kingdom after 100 years of being controlled by that kingdom. See a full list of Crusader Kings III kingdoms.
Empire is the highest level of the landed titles and has De Jure Claim under all lower levels under their realm. A character who has an Empire is called an emperor. The emperor must hold or control all county titles in the de jure kingdom, and the empire title to which the kingdom belongs de jure either does not exist or is not held by that emperor. See a full list of Crusader Kings III empires.