Game concept
Dynasty Head
From the game's encyclopedia
A Dynasty Head is the House Head that heads the entire Dynasty and all of its Houses.
The Dynasty Head wields certain unique powers over the members of the Dynasty, known as Dynasty Head Interactions. The Dynasty Head also picks Dynasty Legacies for the Dynasty.
Normally, the Dynasty Head is the House Head that can have the most Soldiers. If all House Heads have the Bureaucratic Government, the Dynasty Head is instead whoever has the highest Powerful Family Rating.
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.
Dynasty Head is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "A Dynasty Head is the House Head that heads the entire Dynasty and all of its Houses." It is part of Dynasty. It covers Dynasty Head Interaction. Patch 1.20.1.2, from game/common/game_concepts/00_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/00_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.