special_invasion_cb_seize_land_in_region_trigger

special_invasion_cb_seize_land_in_region_trigger = {
	OR = {
		AND = { # For Duchies
			tier = tier_duchy
			OR = {
				# Title is in the specified region
				capital_vassal = {
					title_province = {
						geographical_region = $TARGET_REGION$
					}
				}
				# Title is owned by the current holder of the invasion's target kingdom
				AND = {
					holder ?= $TARGET_KINGDOM$.holder
					kingdom = $TARGET_KINGDOM$
				}
			}
		}
		AND = { # For Counties
			tier = tier_county
			OR = {
				# Title is in the specified region
				title_province = {
					geographical_region = $TARGET_REGION$
				}
				AND = {
					holder ?= $TARGET_KINGDOM$.holder
					kingdom = $TARGET_KINGDOM$
				}
			}
			trigger_if = {
				# If our de jure liege is an existing duchy that would have been seized in the duchy step, do not transfer the county (it has already been transferred).
				limit = {
					de_jure_liege ?= {
						exists = holder
						OR = {
							capital_vassal = {
								title_province = {
									geographical_region = $TARGET_REGION$
								}
							}
							AND = {
								holder ?= $TARGET_KINGDOM$.holder
								kingdom = $TARGET_KINGDOM$
							}
						}
					}
				}
				always = no
			}
		}
	}
}

As written in game/common/scripted_triggers/00_war_and_peace_triggers.txt.