Margaret Theresa of Spain was born into the most powerful dynasty in Europe, a family whose empire spanned the globe but whose bloodline was collapsing from within. She arrived on July 12, 1651, in the Royal Alcazar Palace in Madrid, the daughter of King Philip IV of Spain and his niece, Mariana of Austria. The Habsburgs had conquered Europe not only through war but through a mastery of strategic marriages, and for generations they had sealed their power by marrying within their own family. By the time Margaret was born, that tradition had produced parents who were uncle and niece, and a genetic legacy that would haunt her entire life.
Her father, Philip IV, had ruled Spain since 1621 and was known as the Planet King because the sun never set on his empire. He was nearly thirty years older than his wife, yet the couple adored their daughter. Of their five children, only Margaret and her younger brother Charles survived infancy. Charles would grow into a man so ravaged by generations of inbreeding that he became known as the Bewitched, prematurely aged and plagued by physical deformity and mental decline.
Margaret was healthier than her brother, but she carried the same curse within her. She grew up in a world of extraordinary luxury, surrounded by maids and servants, indulging in sweets and chocolates that she had to hide from court physicians. But beneath the opulence lay a suffocating royal etiquette that governed every movement and every word. As a Habsburg princess, she received an education befitting her station, learning German to converse with her Austrian cousins and Latin for scholarship and the Church.
Yet no education could prepare her for the fate that awaited her. When she was just five years old, her parents commissioned the great painter Diego Velázquez to capture her in a portrait. The result, known today as Las Meninas, became one of the most famous paintings in history. Velázquez depicted Margaret surrounded by ladies-in-waiting and household staff, and he gave striking dignity to the courtier María Bárbola, a woman of short stature who was shown with depth and a piercing gaze rather than as a mere curiosity.
Velázquez painted at least five portraits of the young princess, making her one of the most painted children in early modern Europe. Those portraits would come to contrast sharply with the sad destiny that awaited her. Even as a child, Margaret was already a pawn in the game of European politics. At one point there were discussions of marrying her to Charles Stuart of England, who was restored to the throne in 1660 after England had briefly experimented with being a republic.
That proposal collapsed, largely because King Philip opposed it. Her father instead decided that she should marry into the Austrian branch of the Habsburg family, showing no concern that this would deepen the family’s inbreeding. For the Habsburgs, marriage was never about love or happiness. It was about keeping power in their grip.
When Margaret was just eleven years old, the court announced that she would marry Leopold, a man who was both her first cousin and her uncle. Leopold was her mother’s younger brother and had risen to become Archduke of Austria, King of Hungary, Croatia, and Bohemia, and Holy Roman Emperor in the late 1650s. Even by early modern standards, Margaret was considered too young to marry at the age of eleven, and so the wedding was delayed for years. She finally set out from Madrid in April 1666, just before her fifteenth birthday.
The journey to Vienna took six months, and her Spanish party did not arrive until December. The marriage ceremony took place on December 12, 1666, attended by many of the most powerful royals and dignitaries in Europe, with celebrations that continued throughout 1667. At first, the marriage was unusual but not unhappy. Margaret called her new husband Uncle, despite their close blood relationship, and the two shared interests in art and music.
Leopold tried to make her comfortable in her new surroundings, and Margaret brought members of her old household staff with her from Madrid, some of whom may have been present when Velázquez painted Las Meninas years earlier. Despite these familiar faces, she remained deeply homesick, clinging to her Spanish roots and making little effort to improve her German. As time passed, her health began to fail. Her once delicate beauty faded, her complexion grew paler, her features grew more fatigued, and the characteristic Habsburg jaw became more pronounced.
She became pregnant almost immediately after arriving in Vienna and gave birth to a son named Ferdinand in September 1667, but the boy survived only three and a half months. Their next child, a daughter named Maria Antonia, was born in January 1669 and would become the only one of Margaret’s children to survive. A son, John Leopold, was born on February 20, 1670, and died within hours. Another daughter, Maria Anna, lived just two weeks before dying in February 1672.
In just six years, Margaret endured six pregnancies, including four live births and two miscarriages. Each one left her weaker and more depressed. Observers at the Austrian court commented on her frequent illnesses, and physicians eventually diagnosed her with an enlarged thyroid gland, a condition that had no cure in the seventeenth century and only worsened. Her decline accelerated in the early spring of 1673.
She suffered a three-week-long attack of stomach pains, then developed a fever. Documents written by foreign ambassadors at the court in Vienna indicate that many seriously feared she would die. By early March she had difficulty breathing, and on March 10 a confessor was called to hear her last confession and administer the sacrament. Two days later, on March 12, Margaret Theresa died at the age of twenty-one.
An autopsy revealed that she was carrying another baby boy at the time of her death. She was laid to rest in the Imperial Crypt in Vienna. Her death brought a lengthy period of mourning at the Austrian court, with funeral services stretching on for weeks into April. Leopold was devastated, but his grief did not prevent him from remarrying before the end of the year.
His new wife was Archduchess Claudia Felicitas of Austria, another member of the Habsburg family. The marriage was not about love but about survival; the dynastic game had to continue, and heirs, preferably male, were desperately needed to ensure the Habsburg reign could endure. After Margaret’s death, her rights to the Spanish throne passed to her only surviving daughter, Maria Antonia. When Maria Antonia died in 1692, those rights passed to her only surviving son, Prince Joseph Ferdinand of Bavaria.
His untimely death in 1699, combined with Margaret’s brother King Charles II’s failure to produce an heir, triggered a succession crisis that plunged Spain and all of Europe into a brutal war that lasted nearly fifteen years. The crisis, perhaps above all, was the final consequence of a dynasty that destroyed itself from within through centuries of incestuous marriage. Margaret Theresa, a cherished princess immortalized in one of the most famous paintings in history, had been sacrificed to that tradition, and her short life and her children’s deaths were the price her family paid in pursuit of absolute power.