create_beth_nahrain_scripted_effect

create_beth_nahrain_scripted_effect = {
	#Create Beth Nahrain
	hidden_effect = {
		every_held_title = {
			limit = {
				tier = tier_empire
			}
			every_in_de_jure_hierarchy = {
				limit = {
					tier = tier_kingdom
				}
				set_de_jure_liege_title = title:e_beth_nahrain
			}
		}
	}
}

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