November 23, 1504. Three days before her death, Queen Isabella signed a codicil to her will in which she added a clause on a matter that deeply concerned her. In this it is written that when the Holy Apostolic Faith granted us the islands and mainland of the ocean sea discovered and yet to be discovered, our main motivation was to attract its peoples and convert them to the Catholic faith, sending prelates, clergy, religious and other learned and God-fearing people to instruct the inhabitants in the Catholic faith, teach them good customs and fulfill the diligence of life.
Therefore, I beseech the king my lord and order the princess, my daughter, and the prince her husband, to do so and comply, and that this be their main objective, ensuring that the indigenous people of the Indies, already conquered and yet to be conquered, do not suffer any harm to their property, but are treated justly and that if they have suffered any injustice, it is repaired.
This is the story of the woman who defied fate itself. This is the story of Isabella I of Castile, the Catholic.
In a divided land, without peace or unity, a girl was born who would change the course of history. At just 3 years old, little Isabel is left fatherless. King John II has died and his first son Henry IV inherits the crown of Castile.
The loss of the late king was too much for his mother. They soon begin to show signs of mental decline. In response, the new King Henry IV sent young Isabella, along with her mother and younger brother Alfonso, to live far from the luxuries of the court and the comforts of the palaces. Surrounded by stone walls and quiet fields, Isabel grows up in relative simplicity. The girl observes the melancholy in her mother’s eyes, aware of the deterioration in her mental state. To endure these painful moments, Isabel seeks refuge in her faith, asking for wisdom and strength every day.
Thanks to the help and supervision of select nobles and tutors who remained loyal to the late King John II, Isabel received a thorough education for a princess of her time. He studied the principles of humanism. She learned grammar, rhetoric, basic painting, philosophy and history, instilling in her discipline and a love of learning. In each lesson, the young princess displays an uncommon fervor. His Catholic faith and his thirst for knowledge go hand in hand. Unbeknownst to him, he was preparing for an extraordinary destiny.
Following increasing political instability, King Henry IV, despite never having shown any interest in his half-brothers, summons them to court, probably to keep them under control during this time of uncertainty. Isabel discovers a new world upon arrival, a world of halls overflowing with intrigue and luxuries very different from the austere life she had led until now, but she also learns that the court makes her the object of calculating glances and whispers in the corridors, understanding that in the palace she is more of a pawn on the political chessboard than a sister returning home. Tensions in the kingdom soon engulf her.
In 1465, the rebellion of certain nobles against Henry marked the beginning of what would become a true game of thrones. During the farce of Ávila, these nobles symbolically dispose of the king, raising in his place the infant Alfonso, brother of Isabel, as a figurative monarch. This act, although theatrical, unleashes a civil war. Henry, forced by circumstances, accepts humiliating conditions to preserve his throne. Among them, ironically, it is demanded that Isabel be removed from the court and reside in the Alcázar of Segovia under surveillance.
For the next few years, the kingdom of Castile was divided between those who swore loyalty to Henry IV and those who swore it to the young Alfonso XI. The princess, caught between factions, lives with a divided heart. Family loyalty towards his brother Enrique, but also affection for Alfonso, who is used as a rival to the throne. This anomaly of having two kings in a single kingdom would end with the death of Alfonso the Infante in 1468.
After this event, Henry IV, also known as the Impotent, once again established himself as the absolute monarch of Castile, recognizing Isabella as the heir apparent, displacing the rights of his own daughter Joanna, derisively called La Beltraneja, due to rumors about her dubious paternity, implying that she was actually the daughter of Beltrán de la Cueva, King Henry IV’s right-hand man.
The following year, Isabel received news that King Henry IV had arranged her marriage to Alfonso V of Portugal. Years earlier she had already been proposed to Pedro Girón, Master of Calatrava, a powerful man much older than her. The planned marriage did not take place due to an illness that afflicted Pedro Girón, but now things were different. King Alfonso V enjoyed good health and the backing of a crown. Isabel, on the other hand, had other plans for her future.
Isabel had already decided on her future partner. Her choice is Fernando of Aragon, a young prince with whom she has secretly exchanged letters with the help of her ally, Archbishop Carrillo. He knows that Fernando, heir to Aragon, is brave and intelligent. He is the partner she desires, both for personal affinity and for political strategy. Behind the back of her half-brother, King Henry, Isabella pulls her strings with stealth. Advised by Archbishop Carrillo, she decides to arrange a clandestine marriage with Fernando, son of King John I of Aragon.
To maintain the discretion of the event, 17-year-old Fernando de Aragón arrives disguised as a waiter with a few companions after a long journey that he undertook in secret. In the intimacy of that clandestine ceremony, Isabel and Fernando sealed an alliance that would change the history of Spain. Their secret marriage unites the two most powerful crowns on the peninsula, Castile and Aragon. It is not just an act of love, but a brilliant political move that will consolidate Isabel’s position in Castile and lay the foundations for the future unification of Spain under a single monarchy.
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Castile dresses in mourning. One freezing December morning, Isabel receives the news that her half-brother, King Henry, has died. Without waiting, Isabel summons the powers of the city. He demands recognition of his rights. Before the people of Segovia, Isabel takes the crown, displaying a boldness uncommon in a woman of her time. At just 23 years old, Isabel proclaimed herself Queen of Castile.
The recent coronation is just the beginning. The young queen faces a direct threat to her legitimacy. Her niece Juana la Beltraneja, supported by dissident nobles and by her fiancé, King Alfonso V of Portugal. She also proclaimed herself Queen of Castile. Within weeks, the kingdom is divided and civil war breaks out. This conflict would extend for the next 4 years.
Isabel does not back down. His conviction is unwavering. Although the newly conquered throne hangs by a thread, he summons loyalties, orders mobilization, and organizes the defense of his right. For the next 4 years, Fernando raised his sword. Isabel held the crown. Together they were the judgment and the force that would restore order to Castile. While the soldiers slept, Isabel kept silent watch. the darkness. His soul bowed down to God, but never to men.
The fight is fierce. Swords, spears, blood and betrayal. From a distance, Isabel prays with her rosary in hand as she surveys her royal standard, watching the battles her husband leads in her name. Fernando achieves victory in the decisive battle of Toro. The war for Castile was already numbered.
The war culminated in 1479 with the signing of the Treaty of Alcachovas, where Portugal recognized Isabella as Queen of Castile. Defeated, Juana la Beltraneja is forced to renounce her claims and withdraw her threat. Isabel orders her young niece to enter a cloistered convent in Coimbra, sealing her political destiny forever.
Shortly afterwards, Fernando Segundo ascended to the Aragonese throne, thus uniting Castile and Aragon dynastically under the royal couple. Although each kingdom maintains its own laws and institutions, the duality of power becomes a joint force. In just five years, the young queen has consolidated her legitimacy, pacified Castile, and forged the greatest alliance on the Iberian Peninsula. But his greatest feats were yet to come.
Long before Isabel, seven centuries ago, when the peninsula was a mosaic of fragmented kingdoms, a nobleman resisted in the mountains of Covadonga. His name was Pelayo. For more than 700 years, entire generations lived, fought and died on a land divided by faith between the crescent and the cross, between the south and the north. And so, when Isabella ascended the throne in Castile, that old wound was still bleeding. Granada, the last Muslim kingdom on the peninsula, still stood. a symbol, a bastion, a challenge.
After securing her legitimacy in Castile, Isabella knew that true unity was not yet complete. The south, the last vestige of Islamic power on the peninsula, resisted from Granada. In 1482 the final campaign began, a tough and prolonged war of siege and strategy that would last a whole decade. Isabel, true to her vision of unity under one faith, did not rest. He traveled with the army, inspected camps, took care of the supplies, and looked after the wounded.
It was during that time that a man with a fiery gaze appeared, a foreigner with maps and impossible dreams. Christopher Columbus. He spoke to her of endless oceans, of reaching the east by sailing west. Many ignored it, some mocked it. Isabel no. He listened to it for years. He said no more than once, but he never closed the door because deep down he understood that faith also expands with new wings. And so, while the cannons were pointed at the walls of the Alhambra at the back of their court, another war was being fought, the war of the imagination.
January 1492. The bells rang out in the snowy valleys of Granada. After 10 years of war, the last Muslim kingdom on the peninsula fell. In front of the gates of the Alhambra. Boabdil, the last Nasrid sultan, handed over the keys to the city. silent, defeated. Isabel, dressed in white, contemplated the scene without joy, without revenge, only faith and purpose. With that gesture, a seven-century-long story culminated, from Pelayo in Covadonga to the Andalusian hill. The reconquest had ended, but in the queen’s heart another crusade was beginning.
April 1492. After years of doubt, delays and divided advice, Isabel decides to take a gamble. In that stone room, without knowing it, they signed more than just an agreement. They sealed the beginning of a new world. Columbus received ships, titles, and resources. They say the queen pawned her jewels. He did everything because of his faith. A faith that no longer only sought to unite the peninsula, but also to cross the ocean.
And so, as the sails filled with wind, the old world was left behind. On those wooden planks traveled centuries of faith, ambition, and promise. Isabel, from the mainland, observed and unknowingly opened the door to an entire continent. With that act a new chapter begins, one that will carry the cross and the crown beyond the known world.
Just 4 years later, Isabella I of Castile leaves this world. In her will, the queen sets guidelines for her successors, ensuring the treatment of indigenous peoples as equals, promoting intermarriage with these peoples, and recognizing their royal titles, making evangelization the main mission of Spain.
In 1512, inspired by his last wishes, the laws of Burgos were signed, which among other things legally prohibited the enslavement of Indians. The encomienda system was established, and the Indians were to receive a fair wage. In 1542, these laws were revised to further favor the indigenous population. Years later, the Laws of the Indies emerged, a compilation of all the laws designed to protect and guarantee the rights not only of the Indians, but of all citizens living within the Spanish empire.
Under the empire, everything was legislated. Working hours, leave for pregnancy, maternity and illness. Child and elderly workers were prohibited from working, and there were savings funds to cover workplace accidents. While there were those who resisted compliance with these laws, there were also those who gave their lives to defend these laws and the rights of the Indians.
Isabel was born into a medieval world, full of betrayals, internal conflicts and divided kingdoms, but she left it in the Renaissance, having established the greatest empire of all time, a place where, it is said, the sun never set.
