Nick Sidi
Nick Sidi( born 22 February 1966 in Manchester, England) is an English actor.
He is the son -in- law of actress Rosalind Knight and brother- in- law of actress Susannah Elliott- Knight.
He often plays drama or comedy roles on television and frequently appears in BBC dramas.
Eudocia (daughter of Valentinian III)
Eudocia or Eudoxia (439 – 466/474?) was the eldest daughter of Roman emperor Valentinian III and his wife, Licinia Eudoxia.
She was thus the granddaughter on her mother's side of Eastern emperor Theodosius II and his wife, the poet Aelia Eudocia; and on her father's side of Western emperor Constantius III and his wife Galla Placida.
In the mid-440s, at age 5, Eudocia was betrothed to Huneric, son of the Vandal king Gaiseric (and then a hostage in Italy).
This engagement served to strengthen the alliance between the Western court and the Vandal kingdom in Africa.
Their marriage did not take place at this time, however, because Eudocia was not yet of age.
Eudocia's father was assassinated in 455, and his successor, Petronius Maximus, compelled Eudocia's mother to marry him and Eudocia herself to marry his son, Palladius.
In response, the Vandals (reportedly at the request of Eudocia's mother) invaded Italy and captured Eudocia, her mother, and her younger sister, Placidia.
After 7 years Eudocia's mother and sister were sent to Constantinople, while Eudocia remained in Africa and married Huneric c. 460.
They had a son, Hilderic, who reigned as king of the Vandals, from 523-530.
At some time following the birth of Hilderic, Eudocia withdrew to Jerusalem due to religious differences with her Arian husband.
She died there and was buried in the sepulcher of her grandmother, Aelia Eudocia.
Robert W. Levering
Robert Woodrow Levering( October 3, 1914 – August 11, 1989) was a U.S. Representative from Ohio, son-in- law of Usher L. Burdick and brother- in- law of Quentin N. Burdick.
Antony Armstrong-Jones, 1st Earl of Snowdon
Antony Charles Robert Armstrong- Jones, 1st Earl of Snowdon( 7 March 193013 January 2017), commonly known as Lord Snowdon, was a British photographer and filmmaker.
He was the husband of Princess Margaret and brother- in- law of Queen Elizabeth II.
Charles Francis Norton
Charles Francis Norton( 1807 – 1835) was a 19th- century Member of Parliament for Guildford.
Norton was also a Captain of 52nd Light Infantry; son-in- law of Sir Colin Campbell; brother- in- law of writer Caroline Norton
Gertrude Elizabeth Blood
Gertrude Elizabeth, Lady Colin Campbell ("née" Blood; 3 May 1857 – 1 November 1911) was an Irish-born journalist, author, playwright, and editor.
She was married to Lord Colin Campbell, a brother-in-law of Princess Louise, Queen Victoria's fourth daughter.
Wyndham Goold
Wyndham Goold( 1812-1854) was a Member of Parliament( MP) for County Limerick from 1850 to 1854.
Goold was educated at Westminster School and Trinity College, Dublin.
He was the son in law of Frederick Falkiner Goold, Archdeacon of Raphoe and brother in law of Bishop Hamilton Verschoyle
Placidia
Placidia  was the wife of Olybrius, unrecognized Western Roman Emperor.
Her full name is uncertain.
The "Chronicle of the Roman Emperors:
The reign by reign record of the rulers of Imperial Rome" (1995) by Chris Scarre gives her name as Galla Placidia Valentiniana or Galla Placidia the Younger, based on naming conventions for women in ancient Rome.
Robert Vadra
Robert Vadra is an Indian businessman, entrepreneur and the husband of Priyanka Gandhi.
He is the son -in- law of Sonia Gandhi and Rajiv Gandhi, and the brother- in- law of Rahul Gandhi.
Greg Penner
Gregory B. Penner( born December 18, 1969) is an American businessman and venture capitalist.
Penner was named the chairman of Walmart on June 5, 2015.
He is the son-in- law of S. Robson Walton and the grandson- in- law of Sam Walton, the founder of Walmart.

Question: Who is Eudocia (Daughter Of Valentinian Iii)'s sibling-in-law?
Answer: Olybrius