October 19: Ferdinand II of Aragon married Isabella I of Castile which unifies the two kingdoms into a bigger one: Spain, in 1469.

Between 1475 and 1479 the war was triggered by the succession of Castile. The outcome of the war was the union of the kingdoms of Castile and Aragon through the marriage of Kingdom heirs Ferdinand of Aragon and Isabella of Castile, who used the Roman name of Hispania as España (Spain) and there reigned together until Elizabeth's death in 1504 .

Wedding portrait of King Ferdinand II of Aragón and Queen Isabella of Castile.

Juana, the daughter of Ferdinand and Isabella of Castile inherited his mother and married Philip of Austria. Both went down in history as "Juana La Loca" and "Philip the Handsome".

Ferdinand II (1452-1516) was the son John II of Aragon; he became King of Sicily in 1468, one year before marrying Isabella, daughter of King John II of Castile.  In 1474 when Isabella became queen of Castile, Ferdinand was made co-ruler of the united Kingdoms of Castile and Aragon.  This couple was destined to change dramatically the fate of Spain. 

Felipe died in 1506 and Juana was declared incapable, so her father took over the government of Castile until his death in 1516.

Spain emerged as the most powerful and extensive kingdom in the world since 1492 with the discovery of the New World.