Finally, Pope Pius XII in the Brief _Litteris suis_ issued at St. Peter’s, Nov. 11, 1939,[38] abolished the title to nobility of all knights to be nominated in the future. In giving the reason for this rule, the Pope reiterated the words of his predecessor, namely that the order was not instituted to encourage vanity and ambition, but only to reward personal merit. ORDER OF ST. GREGORY THE GREAT ORDO GREGORIANUS In the United States probably the best known of all the Pontifical Orders of Knighthood is the Order of St. Gregory, although it was originally instituted to honor the citizens of the erstwhile Papal States. When the energetic general of the Camaldulese became Pope under the name of Gregory XVI (1830-46), the Papal States were frequently troubled with political uprisings. In suppressing these rebellious movements, the Pope was aided not only by Austrian troops but also by many of his own faithful subjects. To honor those who had distinguished themselves in the defense of the temporal power of the Holy See, Gregory erected an order of knighthood which he named after the first Pope who bore his own name, Saint Gregory I (590-604), and who is considered by several historians as the real founder of the temporal power of the Popes. However, the Brief _Quod summis quibusque_, issued at St. Mary Major (Sept. 1, 1831), whereby Gregory XVI erected this new pontifical order, does not restrict its membership explicitly to his own subjects, but extends it to those persons who have shown “incontrovertible loyalty to the Holy See,” and to those who have distinguished themselves by their virtue and piety, by their social position, by the zeal evidenced in fulfilling high office, or, in general, by the excellent reputation in which they are held. The Pope decreed that the emblem of the order should be an eight-pointed red cross, having a little white medal in the center engraved with a picture of Saint Gregory the Great, the reverse of the medal carrying the motto _Pro Deo et Principe_. The cross hangs from a red ribbon with yellow borders, the colors of the order. As originally instituted the order consisted of four degrees: (1) the Knights Grand Cross of the first class, who wore the cross on the grand cordon, and who were also entitled to wear a large cross in the form of a jewelled star on the chest; (2) Knights Grand Cross of the second class, who wore the same large ribbon but only a small single plaque on the left chest; (3) Knights Commanders whose cross hung from a ribbon around the neck; (4) Knights who wore the cross on the left chest.