Patrick Cosgrave was the only child of an improvident builder, who died from cancer when Patrick was ten, leaving his mother impoverished. She took work as a cleaner in the Chapel Royal in Dublin Castle. Cosgrave rebelled against the severe Roman Catholic piety of his mother and his teachers at St. Vincent's C.B.S. in Glasnevin. He acquired a love of British history aged 14, while reading as a convalescent from rheumatic fever. He read works by Rudyard Kipling, Winston Churchill, and Lawrence of Arabia.

At University College Dublin (UCD), he was influenced by Desmond Williams, professor of history. He embraced the epithet "West Brit"; at a debate, when an opponent accused him of being "to the Right of Douglas-Home", he retorted that he was "to the Right of Lord Salisbury". He claimed that his grandfather, a warden in Mountjoy Prison, had beaten up Kevin Barry, a Republican rebel executed in 1920. He partnered Anthony Clare to win the Irish Times debate and the Observer Mace debate, and was elected auditor of the Literary and Historical Society in spite of his unpopular pro-British views.

At Cambridge University he switched from "Paddy" to "Patrick", and earned a doctorate in history from Peterhouse. His supervisor was Herbert Butterfield, whom he later described as "the greatest influence on my life I can define". He was among the Peterhouse alumni nicknamed "the reactionary chic" by The New Statesman.

Having freelanced for Radio Telefís Éireann while at UCD, he was appointed their London correspondent in 1968, before working at the Conservative Research Department from 1969, where he became a Zionist. He became political editor of The Spectator in 1971, where his numerous, often scathing, articles about Ted Heath's leadership were influential in effecting the change to Margaret Thatcher, and earned him the nickname "The Mekon".

When Thatcher first saw him speaking on television, she reportedly dismissed him as a "typical upper-class public school twit", to his subsequent delight. In 1975, he became her advisor while she was Leader of the Opposition. He seemed on the path to a safe seat in Parliament and ultimately a cabinet post. However, Thatcher dropped him after winning power in the 1979 general election, by which time his heavy drinking was impairing his reliability. Private Eye suggested Thatcher dropped him because had vomited on her in a taxi, though the story is disputed.

Subsequently he was briefly editor-in-chief of Tiny Rowland's Lonrho publications. He had first attracted Rowland's attention in 1973 after criticising in The Spectator Ted Heath's calling Lonrho "the unacceptable face of capitalism". After this, earning a precarious living as a freelance journalist and by writing books, mainly political biographies. Among other publications, he wrote for The Times, The Daily Telegraph, The Independent, The Irish Times, The Irish Press, the Literary Review, Encounter, the New Law Journal, and Le Point.

Books

Cosgrave's first book was a review of the poetry of Robert Lowell.

reprinted in

[[Martin Seymour-Smith]] derided the book, but Lowell agreed with Cosgrave's criticism of "Mr Edwards and the Spider", and dedicated a rewritten version to him.

His 1978 biography of Margaret Thatcher was faulted for hero-worship; George Gale called it "not much above a hagiography". His biography of Enoch Powell, whom he also admired, was made with access to Powell and his correspondence, and was the work of which he was most proud. He completed only the first volume of a planned two-volume study of Winston Churchill during World War II.

He published three mystery novels featuring the daring Colonel Allen Cheyney.

He obtained a British passport and sometimes attended services of the Church of England, while remaining agnostic. In contrast to his public image as a vigorous polemicist, he was considered kind and courteous in private.

He married three times and divorced twice. His first marriage in 1965 was to Ruth Dudley Edwards, a fellow student at UCD and, later, Cambridge. He married Norma Green, mother of his daughter Rebecca, in 1974; and Shirley Ward, his widow, in 1981; she was secretary of the European Democrats at the European Parliament.

He had financial problems from the late 1970s and when Green left him in 1980, Rebecca was made a ward of court. In 1981 the Inland Revenue filed a tax demand for over £10,000 and he was declared bankrupt. His debt of £18,700 was discharged in 1985.

He died of heart failure. His poor health was exacerbated by heavy drinking and smoking.

Books

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Papers

Articles

Other

• (letter to the editor)
• Master's thesis (NUI, 1965): Peter Walsh and the Irish Remonstrance, 1660—1665
• Doctoral thesis (Cambridge, 1970): Sir Edward Grey and British foreign policy in the Balkans, 1914-16: a study in war diplomacy.
• Dictionary of National Biography: biographies of Julian Amery, Tufton Beamish, Cyril Black, John Biggs-Davison, Nicholas Budgen, Nigel Fisher, Ray Mawby, Nicholas Ridley, Joan Vickers, and Harold Watkinson.
• Obituaries:
• The Independent: John Biffen, David Renton, Peter Shore, Howard Johnson, Julian Critchley, Bernard Braine, William Whitelaw, Petre Crowder, Unity Lister, David Lane, Cuthbert Alport, Nicholas Budgen, Rupert Speir, Percy Grieve, Edgar Keatinge, Tiny Rowland, John Boyd-Carpenter, Patrick Wall, Ian MacGregor, Anthony Fell, Ian Percival, Simon Wingfield Digby, David Crouch, Enoch Powell, John Hay, John Farr, Gilbert Longden, Tom Normanton, Margot Walmsley, Michael Shersby, Nicholas Baker, Chaim Herzog, Guinevere Tilney, Lord Chelmer, Horace Cutler, Geoffrey Rippon, Robert Grant-Ferris, Reginald Bevins, David Gilroy Bevan, Geoffrey Finsberg, Nigel Fisher, Humphrey Atkins, Julian Amery, Lord Fraser of Kilmorack, John Morrison, Harold Watkinson, Alec Douglas-Home, Peter Morrison, Geoffrey Dickens, Felicity Yonge, Charles Irving, Nicholas Fairbairn, John Vaughan-Morgan, Keith Joseph, Denys Bullard, John Blackburn, Arthur Tiley, Joan Vickers, John Tilney, Walter Clegg, Arthur Vere Harvey, Robin Turton, Angus Maude, Aidan Crawley, Peter Mills, John Langford-Holt, Norvela Forster, Robert Adley, Russell Pipe, Michael McNair-Wilson, Nicholas Ridley, Judith Chaplin Oliver Poole, Charles Mott-Radclyffe, Diana Neave, Peter Legh, 4th Baron Newton, Sir John Arbuthnot, Terence Clarke, Godman Irvine, Michael Hicks Beach, 2nd Earl St Aldwyn, Derek Walker-Smith, Shelagh Roberts, William Rees-Davies, Arthur Jones, Cyril Black, Hugh Molson, Richard Holt, Godfrey Nicholson, William Sidney, 1st Viscount De L'Isle, John Stradling Thomas, Francis Pearson, Donald Kaberry, Lord Marshall of Leeds, Elizabeth Douglas-Home, Peter Agnew, Ian Gow, Raymond Mawby, Margaret Shepherd.