It would be a foolish explanation that Isabella won the crown of Castile from the beginning and get support from that crowd. It took ten years for her to be fully accepted as a legal ruler. Meanwhile, many important factors have been developed that are considered the most obvious causes of her success. The most important of these is her solid, intelligent and familiar personality and personality. Without these functions, other factors are irrelevant.
From the end of the 14th century Castile and Aragon worked under invalid monarchs, from Isabel and Fernando (Isabela and Ferdinand), and their marriage in 1469 will merge the two kingdoms. In 1474, Isabel succeeded in the throne of Castile, and in 1479 he succeeded the Karstein dynasty of Aragon. The joint control of the Catholic monarch (Reyes Castolicus) dates back to 1479. Pious Isabel and Machiavellian Fernando became a team without side by side. So far the rulers of Granada were defeated by internal feuds. Christians used this situation because things became a chaotic civil war. After a long siege, Isabel and Fernan entered Granada on January 2, 1492 and celebrated the most important year of Spanish history.
In 1469 Prince Fernando of Aragon married her cousin Castilian heir Isabel. Five years later, Isabel became the throne of his own country. Whether it is personality or political fate, this is a strong alliance. Isabel is very religious, but she was told from contemporary people "mistress imitating imitation". In other words, Fernando is a dynamic and attractive personality, a brave soldier and a respected commander, but he may be ruthless and opposed like his wife. When French Louis XI was told that he was deceived twice, Fernando protested, "French king lies, I deceived ten times, not twice twice."
In 1474, the death of King Castile King Henry IV caused a power struggle called Battle of Castile and Throne (1475-79). The fight of Castilian throne is Castilla of Henry's sister Isabella I who acquired Henry's one-time heir, Joanna La Beltranja, and Aragon, supported by Portugal and France. Support of the Kingdom and Castilian nobility. Isabella maintained the throne and dominated her husband Ferdinand II. Isabella and Ferdinand married in Valladolid in 1469. At modern daybreak, their marriage joined the two crowns and lay the foundation for the establishment of the Kingdom of Spain. However, as each region maintains its own political and judicial structure, this alliance is only a nominal alliance. According to the agreement signed by Isabella and Ferdinand on 15th January 1474, Isabella has the power to dominate the new unified Spain more than her husband despite its unified rule.