Isabella II in the context of "King Ferdinand VII"

The current Spanish constitution refers to the monarchy as "The Crown" and the constitutional title of the monarch is simply rey/reina de España: that is, "king/queen of Spain". However, the constitution allows for the use of other historic titles pertaining to the Spanish monarchy, without specifying them. A royal decree promulgated 6 November 1987 at the Council of Ministers regulates the titles further, and on that basis the monarch of Spain has a right to use ("may use") those other titles appertaining to the Crown. Contrary to some belief, the long titulary that contains the list of over 20 kingdoms is not in state use, nor is it used in Spanish diplomacy. In fact, it has never been in use in that form, as "Spain" was never a part of the list in the pre-1837 era when the long list was officially used.

Spain, mentioned differently in the titulary depending on which monarch was reigning, was for more than three centuries also symbolized by the long list that started "... of Castile, León, Aragón, ..." The following long titulary in the feudal style was last used officially in 1836 by Queen Isabella II (see the account of titulary in her article) before she became constitutional queen.

The Council of the Indies (Spanish: Consejo de las Indias), officially the Royal and Supreme Council of the Indies (Spanish: Real y Supremo Consejo de las Indias, pronounced [reˈal i suˈpɾemo konˈsexo ðe las ˈindjas]), was the most important administrative organ of the Spanish Empire for the Americas and those territories it governed, such as the Spanish East Indies. The Spanish Crown asserted absolute power over the Indies, and the Council of the Indies was the administrative and advisory body to the Crown in respect of those overseas realms. It was established in 1524 by Charles V to administer "the Indies", Spain's name for its territories. Such an administrative entity, on the conciliar model of the Council of Castile, was created following the Spanish conquest of the Aztec Empire in 1521, which demonstrated the importance of the Americas. Originally an itinerary council that followed Charles V, it was subsequently established as an autonomous body with legislative, executive and judicial functions by Philip II of Spain and placed in Madrid in 1561.

The Council of the Indies was abolished in 1812 by the Cortes of Cádiz, briefly restored in 1814 by Ferdinand VII, and definitively abolished in 1834 by the regency, acting on behalf of the four-year-old Isabella II.

1868 (MDCCCLXVIII) was a leap year starting on Wednesday of the Gregorian calendar and a leap year starting on Monday of the Julian calendar, the 1868th year of the Common Era (CE) and Anno Domini (AD) designations, the 868th year of the 2nd millennium, the 68th year of the 19th century, and the 9th year of the 1860s decade. As of the start of 1868, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.

The Teatro Real (English: Royal Theatre or Royal Opera House) is an opera house in Madrid, Spain. Located at the Plaza de Oriente, opposite the Royal Palace, and known colloquially as "El Real" (The Royal One). it is considered the top institution of the performing and musical arts in the country and one of the most prestigious opera houses in Europe.

The groundbreaking of the Teatro Real was on 23 April 1818, under the reign of King Ferdinand VII, and it was formally opened by his daughter Queen Isabella II on 19 November 1850. It closed in 1925 due to damage to the building and reopened on 13 October 1966 as a symphonic music venue. Beginning in 1991, it underwent major refurbishment and renovation works and finally reopened as an opera house on 11 October 1997. It has a floor area of 78,210 square metres (841,800 sq ft) and a maximum capacity of 1,958 seats.