Game concept
Kurultai
The game also links it as Kurultais, Kurultai Member, Kurultai Members.
From the game's encyclopedia
The Kurultai replaces the Council for the Nomadic Government. The Kurultai members are among the elite of the realm, and should either be appeased or forced into Obedience to assure a smooth Succession.
After the event of a chaotic succession, they may steal some Herd, abandon their new Liege, they will gain a Claim on the Realm Title.
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.
Kurultai is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "The Kurultai replaces the Council for the Nomadic Government." It is part of Councillor. The game also links it as Kurultais, Kurultai Member and Kurultai Members. Patch 1.20.1.2, from game/common/game_concepts/mpo_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/mpo_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.