Duke of Moctezuma de Tultengo (Spanish: Duque de Moctezuma de Tultengo) is a hereditary title of Spanish nobility held by a line of descendants of Emperor Moctezuma II, the ninth Tlatoani, or ruler, of Tenochtitlan. Since 1766, the title has been attached to a Grandeza de España, or a place in the Spanish peerage — the highest honor accorded to Spanish nobility (see also Mexican nobility).