Game concept · All Under Heaven
Disciple Limit
The game also links it as Limit.
From the game's encyclopedia
The Disciple Limit is a capacity on how many Disciples an Elder can have at a given time.
The limit is 5 by default. It can be increased by, for example, improving a Domicile with certain Domicile Buildings.
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.
Disciple Limit is an entry of Crusader Kings III's in-game encyclopedia (All Under Heaven). The game explains it: "The Disciple Limit is a capacity on how many Disciples an Elder can have at a given time." It is part of Disciple. The game also links it as Limit. Patch 1.20.1.2, from game/common/game_concepts/tgp_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/tgp_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.