tgp_distant_realm_marriage_trigger

tgp_distant_realm_marriage_trigger = {
	$RECIPIENT_SPOUSE$ = {
		culture = { has_cultural_parameter = reduced_marriage_acceptance_distant_realms }
		top_liege != $ACTOR_SPOUSE$.top_liege
		trigger_if = {
			limit = { exists = capital_province }
			capital_province = { save_temporary_scope_as = from }
		}
		trigger_else = {
			location = { save_temporary_scope_as = from }
		}
		trigger_if = {
			limit = { exists = $ACTOR_SPOUSE$.capital_province }
			$ACTOR_SPOUSE$.capital_province = { save_temporary_scope_as = to }
		}
		trigger_else = {
			$ACTOR_SPOUSE$.location = { save_temporary_scope_as = to }
		}
		"scope:from.squared_distance(scope:to)" > squared_distance_medium
	}
}

As written in game/common/scripted_triggers/10_tgp_triggers.txt.