The Duchess of Alba was a Spanish aristocrat, landowner, art collector, and social figure who had a net worth of $3.5 billion at the time of her death in 2014.

Her full name was María del Rosario Cayetana Alfonsa Victoria Eugenia Francisca Fitz-James Stuart y de Silva, but throughout Spain, she was known simply as Cayetana or "La Duquesa."

As the 18th Duchess of Alba, Cayetana served as the head of one of Europe's oldest and wealthiest noble families. At various points in her life, she held more than 40 hereditary titles and was a grandee of Spain 14 times over. Guinness World Records recognized her as the world's most titled aristocrat.

The House of Alba fortune included tens of thousands of acres of land, historic palaces in Madrid, Seville, and Salamanca, and an extraordinary art collection containing works by Goya, Velázquez, Titian, Rubens, Rembrandt, Renoir, and other masters. The family's archives also contained rare books, letters, maps, and documents connected to Christopher Columbus and the earliest European voyages to the Americas.

Despite her immense wealth and centuries-old lineage, Cayetana became famous for rejecting many of the conventions associated with aristocratic life. She wore brightly colored dresses, embraced flamenco culture, spoke bluntly to reporters, and remained a fixture in Spanish gossip magazines well into her eighties. Her third marriage, to a civil servant nearly 25 years her junior, turned her into an international celebrity and reinforced her reputation as Spain's most unconventional aristocrat.

The Duchess of Alba's $3.5 billion net worth was based on estimates that valued the broader House of Alba fortune at roughly €2.8 billion. Most of that wealth was tied up in property, artwork, land, and historical assets rather than cash or publicly traded investments.

The fortune was believed to include:

• Artwork and historical collections: The House of Alba owned paintings by Goya, Velázquez, El Greco, Titian, Rubens, Rembrandt, Fra Angelico, and Renoir, along with sculptures, tapestries, antique furniture, rare books, and documents connected to Christopher Columbus. The collection was likely worth well over $1 billion.
• Palaces and historic properties: Major holdings included Liria Palace in Madrid, the Palace of Dueñas in Seville, and Monterrey Palace in Salamanca, as well as castles, estates, and other residences. Their combined value was likely in the hundreds of millions of dollars.
• Agricultural land: The family controlled tens of thousands of acres in Seville, Córdoba, Salamanca, and other regions. The holdings included farms, crops, livestock operations, buildings, equipment, and agricultural businesses.
• Other assets: The remainder of the fortune included private homes, jewelry, securities, cash, furnishings, and interests in family-controlled companies.

Many of the family's most valuable artworks and properties were also protected under Spanish heritage laws, limiting how they could be sold or transferred.

In 2011, before marrying Alfonso Díez, Cayetana transferred much of her estate to her six children while retaining the right to manage and use many of the assets during her lifetime. Díez formally renounced any claim to the family fortune.

The $3.5 billion figure therefore represented the value of the wider fortune Cayetana controlled as head of the House of Alba, not necessarily the value of assets held solely in her name when she died.

María del Rosario Cayetana Fitz-James Stuart y de Silva was born on March 28, 1926, at Liria Palace in Madrid. She was the only child of Jacobo Fitz-James Stuart y Falcó, the 17th Duke of Alba, and María del Rosario de Silva y Gurtubay.

Her godparents were King Alfonso XIII of Spain and his wife, Queen Victoria Eugenia. Cayetana belonged to a family whose ancestry connected her to several European royal and aristocratic dynasties. Through James FitzJames, the 1st Duke of Berwick, she was descended from King James II of England and Scotland and his mistress Arabella Churchill. That lineage also made her a distant relative of Winston Churchill and Diana, Princess of Wales.

Cayetana's mother suffered from tuberculosis and died when Cayetana was eight years old. She was raised primarily by her father, to whom she remained deeply attached.

Political turmoil in Spain disrupted her childhood. After the declaration of the Second Spanish Republic and the outbreak of the Spanish Civil War, Cayetana spent time in Paris and London. Her father represented the Spanish government in Britain during the Civil War and subsequently served as Spain's ambassador to the United Kingdom during World War II.

While living in London, Cayetana received a broader and more international education than she likely would have received in Spain at the time. She moved in British aristocratic and royal circles and became acquainted with the future Queen Elizabeth II, who was born only weeks after her.

Cayetana returned to Spain as a teenager and divided her time among the family's grand residences. Liria Palace had been badly damaged during the Spanish Civil War, destroying much of the building while leaving portions of the art collection and archives intact. Her father devoted years to reconstructing the palace, and Cayetana later continued his efforts to preserve the family's cultural holdings.

When her father died in 1953, Cayetana succeeded him as head of the House of Alba and became the 18th Duchess of Alba. She was only the third woman to hold the dukedom in her own right.

Her principal title was Duchess of Alba de Tormes, but she also held numerous other duchies, marquessates, counties, and a viscountcy. Her titles made her a grandee of Spain 14 times over. Because some titles were transferred to her children during her lifetime, published accounts differed over whether she possessed 40, 46, 49, or more than 50 titles.

Her status inspired several enduring legends. It was often claimed that she did not have to kneel before the pope and could ride a horse into Seville Cathedral. Another popular story held that Queen Elizabeth II would have to curtsy to her because Cayetana possessed more titles. In practice, royal protocol took precedence, and Cayetana curtsied when she met the Queen at an official dinner.

The House of Alba controlled one of Spain's largest private fortunes. Its holdings included farmland and estates across the country, leading to the frequently repeated claim that Cayetana could travel from one end of Spain to the other without leaving her own property.

The family's best-known residences included Liria Palace in Madrid, the Palace of Dueñas in Seville, and Monterrey Palace in Salamanca. Cayetana also spent time at homes in Ibiza, Marbella, and San Sebastián.

Liria Palace served as the family's principal Madrid residence and housed much of the Alba art collection and historical archive. The collection was accumulated across five centuries and included paintings by Goya, Velázquez, El Greco, Titian, Rubens, Rembrandt, Fra Angelico, Renoir, and other European masters.

Among its most famous pieces were Goya portraits connected to the House of Alba, including a portrait of Cayetana's ancestor, the 13th Duchess of Alba. The library and archive preserved early editions of important books and a major collection of correspondence and documents connected to Christopher Columbus.

Much of the family's cultural property was protected as part of Spain's national heritage. As a result, its most important works could not simply be sold or removed from the country without government approval. The House of Alba Foundation was established to preserve the palaces, artworks, archives, and other historical assets for future generations.

Cayetana regarded culture, rather than money alone, as the true foundation of aristocracy. She painted, collected art, supported exhibitions, and welcomed artists, designers, actors, and political figures into the family's homes.

Pablo Picasso reportedly wanted to paint her as Goya had painted the 13th Duchess of Alba, both clothed and nude. Cayetana later said that her first husband opposed the proposal. A portrait by Picasso, particularly a nude one, would have created a major scandal in Francisco Franco's conservative Spain, especially because Picasso was a communist and an outspoken opponent of the dictatorship.

In 1959, Cayetana hosted a fashion show by Yves Saint Laurent at Liria Palace. She also entertained international visitors including Audrey Hepburn, Jackie Kennedy, and prominent members of European royalty. During a lengthy honeymoon in the United States following her first wedding, she visited Hollywood and met stars including Marilyn Monroe and Marlene Dietrich.

Her own wardrobe ranged from formal couture by designers such as Cristóbal Balenciaga and Christian Dior to colorful, bohemian dresses. In later years, her frizzy hair, heavy makeup, flowered clothing, and extensive jewelry made her instantly recognizable.

Cayetana was one of the first European aristocrats to become a modern celebrity independent of any official political role. She appeared constantly in Spanish magazines and television programs and rarely seemed bothered by the attention. When old topless photographs of her appeared in the press in 2011, she reportedly enjoyed the renewed publicity, remarking that being forgotten was worse than being exposed.

In October 1947, Cayetana married Luis Martínez de Irujo y Artázcoz, the son of the Duke of Sotomayor. Their wedding was held at Seville Cathedral and became one of the grandest European social events of the postwar era. Contemporary reports described it as "the most expensive wedding in the world."

The celebration was particularly striking because Spain was still recovering from the devastation and poverty of the Civil War. Thousands of people gathered in Seville to watch the ceremony, which brought together European aristocrats, diplomats, politicians, and members of Spanish high society.

Cayetana and Luis had six children: Carlos, Alfonso, Jacobo, Fernando, Cayetano, and Eugenia. Each child eventually received noble titles and a portion of the family's property.

Luis died of leukemia in 1972. Their eldest son, Carlos Fitz-James Stuart, later succeeded his mother as the 19th Duke of Alba and became head of the House of Alba.

In 1978, Cayetana surprised conservative Spanish society by marrying Jesús Aguirre y Ortiz de Zárate, an intellectual, publishing executive, cultural official, and former Jesuit priest. He was 11 years younger than she was and had previously served as her confessor.

Aguirre had left the priesthood before the marriage and had established himself in Spain's literary and cultural world. Nevertheless, the idea of the Duchess of Alba marrying a former priest was considered scandalous in some aristocratic circles.

The couple remained together until Aguirre's death in 2001. During their marriage, he became closely involved in the intellectual and administrative life of the House of Alba and helped oversee its cultural activities.

Cayetana's personal life again became front-page news when she began a relationship with Alfonso Díez Carabantes, a civil servant nearly 25 years her junior. Several of her children publicly opposed the relationship and reportedly feared that Díez was interested in the family fortune.

Cayetana rejected those objections, pointing out that her children had experienced complicated romantic lives of their own. To resolve the financial dispute, she arranged an advance distribution of much of her estate among her six children. Díez also signed an agreement renouncing any claim to her wealth, noble titles, property, pension rights, or inheritance.

Cayetana and Díez married in October 2011 at the Palace of Dueñas in Seville. She was 85 years old. After the ceremony, she removed her shoes and danced a sevillana in front of the palace as photographers and spectators watched. Images of the duchess dancing barefoot with her arms raised became one of the defining moments of her public life.

Although many Spaniards admired Cayetana's independence and flamboyant personality, her immense landholdings also attracted criticism, particularly in Andalusia, where large private estates coexisted with poverty among agricultural workers.

In 2006, the Andalusian government honored her as a "Favored Daughter of Andalusia." The agricultural workers' union SOC organized a protest, arguing that an aristocratic landowner who controlled roughly 84,000 acres and received significant European Union agricultural subsidies should not receive the award.

Police dispersed the demonstration, and several protesters were injured. Cayetana later dismissed the participants as "madmen" and "delinquents." The union sued her for slander and won, resulting in an order that she pay damages.

The dispute highlighted the divide between Cayetana's popular image as a free-spirited celebrity and her position as the head of one of Spain's largest and most powerful landowning families.

Cayetana began distributing much of her fortune before her death. In 2011, shortly before marrying Alfonso Díez, she transferred major assets to her six children: Carlos, Alfonso, Jacobo, Fernando, Cayetano, and Eugenia Martínez de Irujo. Contemporary Spanish reports valued each child's allocation at roughly €110 million, although the inheritances consisted primarily of land, residences, investments, and interests in family property rather than cash.

Cayetana retained the right to manage and use many of the transferred assets during her lifetime. The arrangement helped address concerns among her children that her third husband might gain a claim to the Alba fortune. Díez separately signed an agreement renouncing any right to her wealth, properties, titles, pension, or inheritance.

Her eldest son, Carlos Fitz-James Stuart, inherited the principal title and became the 19th Duke of Alba. He also succeeded his mother as head of the House of Alba and assumed responsibility for managing its cultural legacy.

The other children received individual noble titles and portions of the family's extensive property holdings. Eugenia, the Duchess of Montoro, received assets including La Pizana, a roughly 1,500-acre agricultural estate outside Seville, and Sa Aufabaguera, the family's vacation property on the island of Ibiza.

The entire $3.5 billion Alba fortune was not divided equally among the six children. Many of its most valuable assets—including Liria Palace in Madrid, Dueñas Palace in Seville, Monterrey Palace in Salamanca, major artworks, and historical archives—were held through the House of Alba Foundation or other family structures. Many paintings, documents, and historic buildings were also protected under Spanish heritage laws, limiting their sale or removal from the country.

As a result, Carlos inherited leadership of the dynasty, while his siblings received substantial individual fortunes without personally owning equal shares of every palace, painting, and historic asset associated with the House of Alba.

Cayetana was hospitalized with pneumonia in November 2014 and later returned to the Palace of Dueñas. She died there on November 20, 2014, at the age of 88.

Her coffin was placed in Seville's City Hall, where thousands of mourners, public officials, family members, and ordinary residents came to pay their respects. The city declared an official period of mourning, and her funeral Mass was held at Seville Cathedral.

Cayetana left behind a complicated legacy. She represented inherited privilege on an almost unimaginable scale, but she also refused to behave like a distant or restrained aristocrat. She danced flamenco, cultivated friendships with artists and entertainers, married whom she pleased, and transformed herself into one of Spain's most recognizable public figures.

Her son Carlos succeeded her as head of the House of Alba, while the family foundation continued preserving Liria Palace, Dueñas Palace, Monterrey Palace, and the family's vast cultural collection. Cayetana remained the best-known member of the modern Alba dynasty: an aristocrat whose palaces, titles, marriages, fashions, feuds, and irreverent personality kept her in the public eye for more than half a century.