Game concept
Game Over
From the game's encyclopedia
The game ends when your current lineage dies out.
However, even if the game is over for your lineage, you can still choose to play as another Ruler anywhere in the world.
The game can end in two ways:
• You die without Player Heir
• You reach the year 1453
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.
Game Over is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "The game ends when your current lineage dies out." 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.