councillor_spouse_valid_position

councillor_spouse_valid_position = {
	AND = {
		NOT = {
			has_diarchy_type = vizierate
		}
		any_spouse = {
			OR = {
				court_owner = root
				AND = {
					is_ruler = yes
					liege ?= root
				}
			}
		}
	}
	NOT = { government_has_flag = government_is_landless_adventurer }
	# Celestial hegemons have access to the ministry instead, so no spouse
	tgp_has_access_to_ministry_trigger = no
}

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