Ferdinand II of Aragon
Marriage and accession

Ferdinand married Isabella, the half-sister and heir presumptive of Henry IV of Castile, on 19 October 1469 in Valladolid, Kingdom of Castile and Leon. Isabella also belonged to the royal House of Trastámara, and the two were second cousins by descent from John I of Castile. They were married with a clear prenuptial agreement on sharing power, and under the joint motto " tanto monta, monta tanto ". He became jure uxoris King of Castile when Isabella succeeded her deceased brother in 1474. The two young monarchs were initially obliged to fight a civil war against Joanna, the purported daughter of Henry IV, and were swiftly successful. When Ferdinand succeeded his father as King of Aragon in 1479, the Crown of Castile and the various territories of the Crown of Aragon were united in a personal union. The various states were not formally administered as a single unit, but as separate political units under the same monarchs. (The legal merging of Aragon and Castile into a single Spain occurred under Philip V in 1707–1715.)

The first years of Ferdinand and Isabella's joint rule saw the Spanish conquest of the Emirate of Granada, the last Islamic al-Andalus entity on the Iberian peninsula, completed in 1492.

The completion of the Reconquista was not the only significant act performed by Ferdinand and Isabella in that year. In March 1492, the monarchs issued the Edict of Expulsion of the Jews, also called the Alhambra Decree, a document which ordered all Jews either to be baptised and convert to Christianity or to leave the country. It allowed Mudéjar Moors (Islamic) and converso Marrano Jews to stay, while expelling all unconverted Jews from Castile and Aragon (most Jews either converted or moved to the Ottoman Empire). 1492 was also the year in which the monarchs commissioned Christopher Columbus to find a westward maritime route for access to Asia, which resulted in the Spanish arrival in the Americas.

In 1494 the Treaty of Tordesillas divided the entire world beyond Europe between Portugal and Castile (Spain) for conquest and dominion purposes – by a north–south line drawn down the Atlantic Ocean.
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