D. Caetano Segismundo de Bragança, full name Caetano Segismundo de Bragança e Ligne de Sousa Tavares Mascarenhas da Silva (Lisbon, 21 May 1856 - Lisbon, 7 October 1927) was a Portuguese nobleman belonging to the House of Lafões who inherited the titles of Duke of Lafões, Marquis of Arronches and Count of Miranda do Corvo from his grandmother. Caetano Segismundo was the son of Pedro João de Portugal e Castro (fourth son of José Bernardino de Portugal e Castro, 5th Marquis of Valença and 12th Count of Vimioso, Minister of War) and Maria Carlota de Bragança e Ligne de Sousa Tavares Mascarenhas da Silva (heiress daughter of the 3rd Duchess of Lafões). Their parents, being legistimists, never took on the titles of the House of Lafões during the Constitutional Monarchy, although their mother, D. Maria Carlota, called herself the 6th Marquise of Arronches. But it was Caetano Segismundo who ended up paying the royalties on the titles of his maternal family's great House, succeeding his grandmother, D. Ana Maria de Bragança as the 4th Duke of Lafões. He was appointed Peer of the Realm in 1882. Six children were born of Caetano Segismundo de Bragança's marriage to the Spanish citizen Leonor de Osete y del Alamo (Madrid, 11 April 1871 - Lisbon, 12 October 1921).

The Order of Santiago (Spanish: Orden de Santiago) is a religious and military order founded in the 12th century. It owes its name to the patron saint of Spain, Santiago (St. James the Greater). Its initial objective was to protect the pilgrims on the Way of St. James, to defend Christendom and to remove the Muslim Moors from the Iberian Peninsula with the Reconquista. Entrance was not restricted to nobility of Spain exclusively, and some members have been Catholic Europeans from other parts of Europe. The Order's insignia is particularly recognisable and abundant in Western art. With the culmination of the Reconquista and the death of the Grand Master Alonso de Cárdenas, the Catholic Monarchs incorporated the Order into the Spanish Crown, and the Pope Adrian VI forever united the office of Grand Master of Santiago to the Crown in 1523. The First Republic suppressed the Order in 1873, but it was re-established in the Restoration as a nobiliary institute of honorable character. The Order was again suppressed after the proclamation of the Second Republic in 1931. With the fall of the Republic and the re-establishment of the Monarchy, the Order of Santiago was definitely restored with the kingship of Juan Carlos I with the character of a nobiliary, honorable, and religious order; and remains as such. The Order of Santiago is one of the four Spanish military orders, together with those of Calatrava, Alcántara, and Montesa. The Order's insignia is said to originate from the Battle of Clavijo, and is a red cross 

resembling a sword, with the shape of a fleur-de-lis on the hilt and the arms. The knights wore the cross stamped on the royal standard and white cape. The cross of the royal standard had a Mediterranean scallop in the center and another one at the end of each arm. The three fleurs-de-lis represent the "honor without stain", which is in reference to the moral features of the Apostle's character. The sword represents the chivalrous character of the apostle St. James and his martyr ways, since he was decapitated with a sword. It can also symbolize taking the sword in the name of Christ, in a certain sense. It is said that its shape originated in the era of the Crusades, when the knights took with them small crosses with sharpened bottoms to stick them in the ground and carry out their daily devotions.