A very basic overview of the system of Nobility used across Brevoy. For a more detailed analysss of who wields power see Influence in Brevoy
Peers control great swathes of land and are either very powerful or directly related to the king. They form the Major Noble Houses of Brevoy, and are seen as almost the equal of the King.
Nobles generally control smaller areas of land (A few hexes) on behalf of one of the Great Nobles of the King.
These are the basic titles of the Aristocratic System. Most aristocrats don't own a significant amount of land, and even the most 'land rich' Aristocrat is unlikely to control more than a hex or two. These titles can be hereditary, although most are role based or lifetime titles.
Administrative Role tiles are an appointment and can be removed by the Appointing Noble (Town, City etc). They are generally unpaid, but the appointee is expected to take advantage of the situation to further their own, or their family, interests. If an appointee is dismissed for bad conduct (such as corruption, illegal dealings or something similar) they may be stripped of some of their (ill-gotten) holdings.