Game concept · All Under Heaven

Leading House

The game also links it as Leading Houses, Leading House's, House Bloc Leadership, Bloc Leadership, Bloc Leader.

From the game's encyclopedia

A Leading House is a House that is the agreed leader of a House Bloc.

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.

Leading House is an entry of Crusader Kings III's in-game encyclopedia (All Under Heaven). The game explains it: "A Leading House is a House that is the agreed leader of a House Bloc." It is part of House Bloc. The game also links it as Leading Houses, Leading House's, House Bloc Leadership, Bloc Leadership and 1 more. Patch 1.20.1.2, from game/common/game_concepts/tgp_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.

for a guide, post or blog

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.