Tina Onassis Niarchos

Athina Mary "Tina" Onassis Niarchos (née Livanos) was born on 19 March 1929 and died on 10 October 1974. She was born in England and was of Greek and French heritage. Her parents were Stavros Livanos, a prominent Greek shipping magnate, and Arietta Zafirakis. She was the second daughter in her family and had at least one sibling, George Stavros Livanos.

Athina Livanos was married three times. Her first marriage was to Aristotle Onassis on 28 December 1946. From this marriage, she had two children: Alexander Onassis, born in 1948 and died in 1973 at the age of 24 due to injuries from an airplane crash in Athens, and Christina Onassis, born in 1950 and deceased in 1988. Athina and Aristotle Onassis divorced in 1960 after she discovered his affair with opera singer Maria Callas. Following the divorce, she resumed using her maiden name, Livanos.

Her second marriage was to John Spencer-Churchill, Marquess of Blandford, on 23 October 1961. He later became the 11th Duke of Marlborough. This marriage lasted until March 1971.

Her third marriage was to Stavros Niarchos in 1971. Niarchos was her former sister-in-law Eugenia's widower and a Greek shipping magnate. This marriage lasted until her death in 1974.

Athina Niarchos died in the Hôtel de Chanaleilles in Paris, the residence she shared with her husband. Her death was officially attributed to an acute edema of the lung, although there have been suggestions that it may have involved a drug overdose. She was interred alongside her sister at the Bois-de-Vaux Cemetery in Lausanne, Switzerland.

Following her death, her daughter Christina Onassis filed a lawsuit against Stavros Niarchos, claiming that the marriage should be annulled under Greek law due to her belief that the marriage was invalid. Christina sought control of her mother's estate, valued at approximately 250 million U.S. dollars in 1974. She later withdrew the lawsuit; Niarchos returned her her mother's wealth, including jewelry, artwork, and personal effects.

Her only surviving descendant is her granddaughter, Athina Onassis, who is Christina's daughter.