is_of_major_interest_trigger

is_of_major_interest_trigger = {
	NOT = { this = $CHARACTER$ }
	OR = {
		is_heir_of = $CHARACTER$
		is_diarch_of_target = $CHARACTER$
		liege ?= $CHARACTER$
		betrothed ?= $CHARACTER$
		is_spouse_of = $CHARACTER$
		has_relation_soulmate = $CHARACTER$
		has_relation_nemesis = $CHARACTER$
		has_relation_best_friend = $CHARACTER$
		has_relation_blood_brother = $CHARACTER$
		is_child_of = $CHARACTER$
		
		AND = {
			is_theocratic_lessee = yes
			is_councillor_of = $CHARACTER$
		}
		
		#They are the head of our faith
		AND = {
			exists = $CHARACTER$.faith.religious_head
			this = $CHARACTER$.faith.religious_head
		}
		# Powerful vassals (including fellow)
		trigger_if = {
			limit = {
				top_liege = this
			}
			any_neighboring_top_liege_realm_owner = {
				this = $CHARACTER$
			}
		}
		# House Head
		trigger_if = {
			limit = {
				exists = $CHARACTER$.house.house_head
			}
			this = $CHARACTER$.house.house_head
		}
		# Activity Intents
		trigger_if = {
			limit = {
				exists = involved_activity
				exists = intent_target
			}
			intent_target = $CHARACTER$
		}
		# Relations
		has_relation_nemesis = $CHARACTER$
		has_relation_soulmate = $CHARACTER$
		has_relation_best_friend = $CHARACTER$
	}
}

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