Answer the question at the end by quoting:

Patrick O'Brian, CBE (12 December 1914 - 2 January 2000), born Richard Patrick Russ, was an English novelist and translator, best known for his Aubrey-Maturin series of sea novels set in the Royal Navy during the Napoleonic Wars, and centred on the friendship of the English naval captain Jack Aubrey and the Irish-Catalan physician Stephen Maturin. The 20-novel series, the first of which is Master and Commander, is known for its well-researched and highly detailed portrayal of early 19th-century life, as well as its authentic and evocative language. A partially finished 21st novel in the series was published posthumously containing facing pages of handwriting and typescript. O'Brian wrote a number of other novels and short stories, most of which were published before he achieved success with the Aubrey-Maturin series.
O'Brian was born Richard Patrick Russ, in Chalfont St. Peter, Buckinghamshire, to Charles Russ, an English physician of German descent, and Jessie Russ (nee Goddard), an English woman of Irish descent. The eighth of nine children, O'Brian lost his mother at the age of four, and his biographers describe a fairly isolated childhood, limited by poverty, with sporadic schooling and long intervals at home with his father and stepmother Zoe Center in Lewes, East Sussex. His literary career began in his childhood with the publishing of his earliest works, including several short stories, the book "Hussein, An Entertainment", and the short story collection Beasts Royal; the latter two brought him considerable critical praise especially considering his youth. He published his first novel at age 15, Caesar: The Life Story of a Panda Leopard, with help from his father.  In 1934, he underwent a brief period of pilot training with the Royal Air Force, but this was not successful, and he left the RAF. Prior to that, his application to the Royal Navy had been rejected on health grounds. In 1935, he was living in London, where he married his first wife, Elizabeth Jones, in 1936. They had two children. The second was a daughter who suffered from spina bifida; she died in 1942, aged three, in a country village in Sussex. When the child died, O'Brian had already returned to London, where he worked throughout the war.  The details of his work during the Second World War are murky. He worked as an ambulance driver, and he stated that he worked in intelligence. Dean King has claimed that O'Brian was actively involved in intelligence work and perhaps special operations overseas during the war. Indeed, despite his usual extreme reticence about his past, O'Brian wrote in an essay, "Black, Choleric and Married?", included in the book Patrick O'Brian: Critical Appreciations and a Bibliography (1994) that: "Some time after the blitz had died away I joined one of those intelligence organisations that flourished during the War, perpetually changing their initials and competing with one another. Our work had to do with France, and more than that I shall not say, since disclosing methods and stratagems that have deceived the enemy once and that may deceive him again seems to me foolish. After the war we retired to Wales (I say we because my wife and I had driven ambulances and served in intelligence together) where we lived for a while in a high Welsh-speaking valley..." which confirms in first person the intelligence connection, as well as introducing his wife Mary Wicksteed Tolstoy as a co-worker and fellow intelligence operative. Nikolai Tolstoy, stepson through O'Brian's marriage to Mary Tolstoy, disputes this account, confirming only that O'Brian worked as a volunteer ambulance driver during the Blitz. Doing this work, he met Mary, the separated wife of Russian-born nobleman and lawyer Count Dimitri Tolstoy. They lived together through the latter part of the war and, after both were divorced from their previous spouses, they married in July 1945. The following month he changed his name by deed poll to Patrick O'Brian.

Did he serve in military?

he underwent a brief period of pilot training with the Royal Air Force, but this was not successful,



Answer the question at the end by quoting:

Hugh Redwald Trevor-Roper, Baron Dacre of Glanton, FBA (15 January 1914 - 26 January 2003), was a British historian of early modern Britain and Nazi Germany. He was Regius Professor of Modern History at the University of Oxford. Trevor-Roper was made a life peer in 1979 on the recommendation of Prime Minister Margaret Thatcher, choosing the title Baron Dacre of Glanton. Trevor-Roper was a polemicist and essayist on a wide range of historical topics, but particularly England in the 16th and 17th centuries and Nazi Germany.
On 4 October 1954, Trevor-Roper married Lady Alexandra Henrietta Louisa Howard-Johnston (9 March 1907 - 15 August 1997), eldest daughter of Field Marshal Earl Haig by his wife, the former Hon. Dorothy Maud Vivian. Lady Alexandra was a goddaughter of Queen Alexandra and had previously been married to Rear-Admiral Clarence Dinsmore Howard-Johnston, by whom she had had three children. There were no children by his marriage with her.  Hugh Trevor-Roper was raised to the Peerage on 27 September 1979, and was introduced to the House of Lords as Baron Dacre of Glanton, of Glanton in the County of Northumberland; he was granted this title being a great-great-great-grandson of the Hon. and Reverend Richard Henry Roper, second and youngest son of Anne, (16th) Baroness Dacre, by her second marriage to Henry Roper, 8th Baron Teynham, and was in remainder to the ancient barony of Dacre.  In his last years he had suffered from failing eyesight, which made it difficult for him to read and write. He underwent cataract surgery and obtained a magnifying machine, which allowed him to continue writing. In 2002, at the age of 88, Trevor-Roper submitted a sizable article on Thomas Sutton to the Oxford Dictionary of National Biography in part with notes he had written decades earlier, which editor Brian Harrison praised as "the work of a master". Trevor-Roper suffered several other minor ailments related to his advanced age, but according to his stepson, "bore all his difficulties stoically and without complaint". That year, he was diagnosed with cancer and died on 26 January 2003 in a hospice in Oxford, aged 89.  Trevor-Roper's personal assets were assessed for probate purposes as PS1,638,119 and he was cremated following a memorial service at the Church of St. Thomas the Martyr in Oxford.

When did Hugh die?
26 January 2003 in a hospice in Oxford, aged 89.