Catholic Monarchs
Overview
 
The Catholic Monarchs is the collective title used in history for Queen Isabella I
Isabella I of Castile
Isabella I was Queen of Castile and León. She and her husband Ferdinand II of Aragon brought stability to both kingdoms that became the basis for the unification of Spain. Later the two laid the foundations for the political unification of Spain under their grandson, Charles V, Holy Roman Emperor...

 of Castile
Crown of Castile
The Crown of Castile was a medieval and modern state in the Iberian Peninsula that formed in 1230 as a result of the third and definitive union of the crowns and parliaments of the kingdoms of Castile and León upon the accession of the then King Ferdinand III of Castile to the vacant Leonese throne...

 and King Ferdinand II
Ferdinand II of Aragon
Ferdinand the Catholic was King of Aragon , Sicily , Naples , Valencia, Sardinia, and Navarre, Count of Barcelona, jure uxoris King of Castile and then regent of that country also from 1508 to his death, in the name of...

 of Aragon
Crown of Aragon
The Crown of Aragon Corona d'Aragón Corona d'Aragó Corona Aragonum controlling a large portion of the present-day eastern Spain and southeastern France, as well as some of the major islands and mainland possessions stretching across the Mediterranean as far as Greece...

. They were both from the House of Trastámara and were second cousins, being both descended from John I of Castile
John I of Castile
John I was the king of Crown of Castile, was the son of Henry II and of his wife Juana Manuel of Castile, daughter of Juan Manuel, Prince of Villena, head of a younger branch of the royal house of Castile...

; they were given a papal dispensation to deal with consanguinity by Sixtus IV. The title of "Catholic King and Queen
Catholic King
The titles Catholic King and Catholic Queen are awarded by the Pope as head of the Catholic Church to monarchs who in the eyes of the papacy embody Catholic principles in their personal lives and state policies. The title remains attached to monarchs descended from whoever received the original,...

" was bestowed on them by the Pope Alexander VI
Pope Alexander VI
Pope Alexander VI , born Roderic Llançol i Borja was Pope from 1492 until his death on 18 August 1503. He is one of the most controversial of the Renaissance popes, and his Italianized surname—Borgia—became a byword for the debased standards of the Papacy of that era, most notoriously the Banquet...

 in 1496, for defending Catholic dogmas within their realms. They married on October 19, 1469, in the city of Valladolid
Valladolid
Valladolid is a historic city and municipality in north-central Spain, situated at the confluence of the Pisuerga and Esgueva rivers, and located within three wine-making regions: Ribera del Duero, Rueda and Cigales...

; Isabella was eighteen years old and Ferdinand a year younger.
 
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