Game concept

Involved Culture

The game also links it as Involved Cultures.

From the game's encyclopedia

Some Cultures start already Involved in the Struggle. Others may become involved due to changing circumstances.

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.

Involved Culture is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "Some Cultures start already Involved in the Struggle." It is part of Struggle. The game also links it as Involved Cultures. Patch 1.20.1.2, from game/common/game_concepts/03_fp2_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.

for a guide, post or blog

Source: game/common/game_concepts/03_fp2_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.