spawn_historical_characters_boilerplate_effect

spawn_historical_characters_boilerplate_effect = {
	county = { save_scope_as = county_scope }
	county.holder = {
		if = {
			limit = {
				is_ai = no
			}
			trigger_event = historical_char_creation_events.1
		}
		else_if = {
			limit = {
				OR = {
					exists = scope:major
					has_game_rule = all_historical_characters
				}
				any_liege_or_above = {
					is_ai = no
				}
			}
			random_liege_or_above = {
				limit = {
					is_ai = no
				}
				trigger_event = historical_char_creation_events.1
			}
		}
		else_if = {
			limit = {
				exists = scope:county_scope.duchy.holder
			}
			scope:county_scope.duchy.holder = {
				trigger_event = historical_char_creation_events.1
			}
		}
		else = {
			top_liege = {
				trigger_event = historical_char_creation_events.1
			}
		}
	}
}

As written in game/common/scripted_effects/00_historical_characters_scripted_effects.txt.