Game concept
Expected Legitimacy
The game also links it as Legitimacy Expectations.
From the game's encyclopedia
The Legitimacy Level that Vassals expect of their Ruler, based on their historical relationship. Some factors that lower the Expectations are:
• Being the De Jure Liege of the vassal
• Being part of the Close Family of the vassal
• Being the Preferred Heir of the vassal
• Being the same Dynasty that the vassal has served for longer than 50 years
• The vassal not being a Powerful Vassal
If the actual Level is below their Expectations they may become unruly: their Opinion will be lower and they may join Factions against their Liege.
Expectations increase with the level of their Primary Title, as well as with the Era.
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Expected Legitimacy is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "The Legitimacy Level that Vassals expect of their Ruler, based on their historical relationship." It is part of Legitimacy. The game also links it as Legitimacy Expectations. Patch 1.20.1.2, from game/common/game_concepts/06_ce1_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/06_ce1_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.