Hans Heinrich Thyssen-Bornemisza

Baroness Margit Bornemisza's grandparents were the Baron Albert Bornemisza de Kászon (1832-1899) and the Countess Gabriella Kornis de Gönczruszka (1834-1902).

In Budapest, Heinrich married the daughter of the king's Hungarian chamberlain Gábor Bornemisza de Kászon et Impérfalva (1859-1915) who, having no sons of his own, adopted Heinrich, the Emperor Franz Joseph I of Austria-Hungary extending his father-in-law's baronial title in the Hungarian nobility to Heinrich and his male-line descendants in 1907.

Thyssen-Bornemisza was born in Scheveningen, Netherlands, the son of Heinrich, Baron Thyssen-Bornemisza de Kászon de Impérfalva (1875–1947) and his first wife, Margit, Baroness Bornemisza de Kászon (1887–1971).

She was a daughter of Rear Admiral Keith McNeil Walter (later Campbell-Walter) (1904–1976), aide de camp of King George VI and his wife, Frances Henriette Campbell (born in 1904), a maternal granddaughter of Sir Edward Campbell, 1st Baronet.

Their children were:

The Thyssen family's fortune was built upon a steel and armaments empire: Heinrich Thyssen had abandoned Germany as a young man and settled in Hungary in 1905.

As part of an attempt to dissolve a trust, thereby acquiring control of her third husband's assets, Tita cast doubt on the paternity of Baron Georg Heinrich Thyssen-Bornemisza, alleging that his father was actually Count Iván Batthyány de Német-Ujvár (1910–1985), the husband of Thyssen's sister, Countess Margit Batthyány (1911-1989).

However, a settlement was reached between the parties before the baron's death, which brought to a "peaceable" conclusion the wrangling over control of the vast Thyssen art collection, which is to remain in Spain, Hans Heinrich having been the founder of the Thyssen-Bornemisza Museum in Madrid.

Hans Heinrich August Gábor Thyssen-Bornemisza de Kászon, Baron Thyssen (13 April 1921 – 27 April 2002), was a Dutch-born Swiss industrialist and art collector.

A member of the Thyssen family, he had a Hungarian title and was heir to a German fortune.

He was born to a German father and an American mother.

Daniel M. Frost and John Kerry are members of his maternal family.

His paternal grandfather was August Thyssen.

Thyssen lived in Spain for most of his adult life.

His fifth and last wife, Carmen "Tita" Cervera, is a former Miss Spain.

He bought more old masters, from Duccio to Francisco Goya; and fifteen years after his father's death, he bought his first piece of modern art, a watercolor painting by Emil Nolde dated from between 1931 and 1935, starting the entry of 20th century's paintings in the collection (including Edgar Degas, Piet Mondrian, Pablo Picasso, and Fernand Léger).

His preference however went to German Expressionism, and he soon became a real expert in painting.

One of the paintings in the museum, Rue Saint-Honoré in the Afternoon, Effect of Rain by Camille Pissarro, belonged to a Jewish couple who were forced to give it to the German government in exchange for an exit visa to the United Kingdom shortly after Kristallnacht in 1939.

He first married at Castagnola-Cassarate, 1 August 1946, Austrian Princess Teresa Amalia Franziska Elisabeth Maria of Lippe-Weissenfeld (21 July 1925 – 16 July 2008), daughter of Prince Alfred of Lippe-Weissenfeld (1896-1970) and Countess Franziska of Schönborn-Buchheim (1902-1987).

She belonged to the cadet branch of House of Lippe who had been reigning princes until the fall of the German Empire in 1918 (following their divorce on 14 May 1954, she married secondly in 1960 Prince Friedrich Maximilian zu Fürstenberg (1926–1969), by whom she had further issue).

Their only son was:

His second marriage was in Colombo, Ceylon, or Paris, 23 June 1954, Anglo-Indian fashion model Nina Sheila Dyer (1930–1965), an heiress to properties in Ceylon; they had no children and divorced on 4 July 1956, pursuant to the settlement of which she received a château in France.

He married for the third time at Lugano-Castagnola on 17 September 1956 New Zealand-born British photographic and fashion model Fiona Frances Elaine Campbell-Walter (b. Takapuna, New Zealand, 25 June 1932).

She later married and divorced Prince Sadruddin Aga Khan and committed suicide in 1965.

They divorced on 20 January 1965, and she went on to have a well-publicized relationship with Greek shipping heir Alexander Onassis, the only son of Aristotle Onassis.

He married for the fourth time at Lugano-Castagnola, 13 December 1967, Lilian Denise Shorto (b. Recife, 23 December 1942), a Brazilian banker's daughter, from whom he was divorced 29 November 1984.

They had one son:

His fifth and final marriage was in Daylesford, Gloucestershire, on 16 August 1985, María del Carmen Rosario Soledad Cervera y Fernández de la Guerra, popularly known as Carmen "Tita" Cervera, (born Sitges, Barcelona, 23 April 1943), who was Miss Spain in 1961.

His widow has also adopted two baby girls, twins, called Guadalupe Sabina and María del Carmen in July 2006.

Hans Henrich died in Sant Feliu de Guíxols, Spain.

He is buried in the family burial vault of Schloss Landsberg in the Ruhr valley near Essen, Germany.

They had no children, but Hans Heinrich adopted her son, Alejandro Borja (born Madrid, 1980, son of Manuel Segura), who married at Barcelona, 11 October 2007 Blanca María Cuesta Unkhoff and had two children: Sacha Thyssen-Bornemisza de Kászon on 31 January 2008 and Eric Thyssen-Bornemisza de Kászon on 5 August 2010.

With his father's death, Thyssen-Bornemisza inherited TBG (Thyssen-Bornemisza Group) Holdings N.V., a business empire that included oil, naval construction (Bremer Vulkan) and large parts of Rotterdam harbor, as well as a major art collection with hundreds of paintings of European masters from between the 14th and the 19th centuries.

Thyssen-Bornemisza was also an avid horse lover.

From then on, his business was limited to art.

By 2015, their descendants had filed a lawsuit against the museum, on the grounds that it was stolen by the Nazis.