Charles Vane-Tempest-Stewart, 7th Marquess of Londonderry

His mother, Theresa ('Nellie'), Marchioness of Londonderry, John Singer Sargent, 1912

The eldest son of The 6th Marquess of Londonderry and Lady Theresa Susey Helen, daughter of The 19th Earl of Shrewsbury, he was educated at Eton College and at the Royal Military College, Sandhurst. His father's family were of partial East Donegal Ulster-Scots descent.

On 22 May 1895, Lord Castlereagh was appointed a second lieutenant in the 2nd (Seaham) Durham Artillery Volunteer Corps, a corps within the Volunteer Force attached to the Royal Garrison Artillery (Western Division) and at the time commanded by his father who owned Seaham Colliery from which many of the part-time gunners were recruited.[2][3] After passing out from Sandhurst, he was commissioned into the Royal Horse Guards as a second lieutenant on 8 September 1897.[4][5] He was promoted lieutenant on 30 August 1899,[6] and appointed adjutant on 9 May 1900.[7]

In early 1901 he was appointed by King Edward VII to take part in a special diplomatic mission to announce the King's accession to the governments of Austria-Hungary, Romania, Serbia, and Turkey.[8] In August 1903, following the King's visit to Ireland, he was appointed a Member Fourth Class (present-day Lieutenant) of the Royal Victorian Order, his father being honoured with the Knight Grand Cross of the Order at the same time.[9] He resigned his position of adjutant in the Royal Horse Guards on 24 March 1904, and was promoted to captain on 6 April.[10][11]

Castlereagh was subsequently pressed by his parents to stand for election to the House of Commons at the 1906 general election for Maidstone. He retained his army commission, but was placed on the half-pay list from January 1910.[12] His relatively unsuccessful career on the depleted Unionist backbenches was broken by a return to the British Army during the First World War.

As Captain Castlereagh MP he travelled to northern France in the first weeks of the war and reached Paris on 29 August 1914, having been gazetted ADC to General William Pulteney the previous day. Although a staff officer, Castlereagh immediately saw plenty of fighting and believed he had shot and killed one of the enemy on 2 September 1914.[13] In the following months of 1914, Castlereagh extensively witnessed the destruction of war and the terrible suffering of the British wounded. He was promoted to the temporary rank of major in his old regiment on 1 November, and to the substantive rank on the 7th.[14][15]

Hitherto reluctant to involve himself, like his father, in Irish politics, the war prompted him to take up the cause of recruitment in Ireland. With his father's death in 1915, he ceased to be MP for Maidstone and inherited the Londonderry title and the immense wealth and status that went with it. His exalted position helped his political career, not least in Ireland, which later brought him favourable attention by the British government. In 1915, Lord Londonderry, as he had now become) ll, was mentioned in despatches and rejoined his regiment, the Royal Horse Guards (The Blues). He saw in 1915 for the first time the horrific effects of gas attack upon human beings when visiting soldiers gassed at the first Battle of Ypres.[16]

In 1916 Londonderry was appointed second-in-command of The Blues, part of the 8th Cavalry Brigade. He served at the front during the Battle of the Somme, witnessing the mass slaughter first hand; his closest friend, Lieutenant Colonel Harold Brassey, best man at his wedding in 1899, was killed. He was an acting lieutenant-colonel from 15 December 1916 to 20 January 1917.[17][18]

Londonderry with his cousin Winston Churchill in 1920, as Under-Secretary of State for Air

In 1917, Londonderry took command of a composite battalion drawn from the 8th Cavalry Brigade with the brevet rank of Lt-Colonel, and the Royal Horse Guards (The Blues) took part in the massed mounted cavalry attacks on Monchy-le-Preux on the morning of 11 April 1917, during the Battle of Arras. Monchy-le-Preux was one of the keys to the northern end of the Hindenburg Line. While reconnoitring the enemy near Monchy the GOC 8th Cavalry Brigade, Brigadier-General Charles Bulkeley-Johnson, was shot in the face; he fell with a piercing shriek, the thirtieth British General to be killed in action or to die of wounds on the Western Front.[19] This put Brevet Lt-Colonel Londonderry temporarily in command of the 8th Cavalry Brigade during their charge in the Battle of Arras. At Monchy 600 cavalrymen were casualties and many more horses died. The animals were tethered in the open, as their riders took cover; attempts to take them to the rear during a "box barrage" only increased the casualties.[20] For Londonderry, the experiences of war and the carnage of his brother officers and the family and school friends he grew up with would, as Professor Kershaw commented, "leave an indelible mark on him".[21]

After serving in the Irish Convention of 1917–18, Lord Londonderry served on the short-lived Viceroy's Advisory Council, meeting at Dublin Castle in the autumn of 1918. Promoted to brevet lieutenant-colonel on 7 November 1918,[22] he retired from the army on 10 September 1919 as a major and brevet lieutenant-colonel.[23]

On 13 August 1920, he was appointed Honorary Colonel of the 55th Medium Brigade, Royal Garrison Artillery in the Territorial Army, the successor unit to his father's 2nd (Seaham) Durham Artillery Volunteers. He continued in that role until World War II, after it had been converted into the 63rd (Northumbrian) Anti-Aircraft Regiment, Royal Artillery in Anti-Aircraft Command.[24]

The Marquess, c.1921

Shield of arms of Charles Vane-Tempest-Stewart, 6th Marquess of Londonderry, KG, GCVO, CB, PC, JP, DL

He was appointed to the new Air Council at Westminster in 1919 by the postwar coalition government. Promoted to Under-Secretary of State for Air in 1920, Londonderry was nevertheless frustrated and took advantage of his Ulster connections to join the first Cabinet of the Government of Northern Ireland in June 1921, as Leader of the Senate and Minister for Education. Londonderry was particularly interested in education and favoured a secularised interest, not the least as a way to end Catholic education.[25] Londonderry appointed the Lynn Commission, headed by Robert Lynn, for advice about education. Lynn stated during the commission's hearings his belief that it would be a waste of public funds to teach Gaelic in the schools, a proposal that was widely seen as promoting Unionism, and led to a Catholic boycott of the commission.[26]

At Belfast, he acted as a check on the increasingly sectarian, partisan and survivalist government of Prime Minister Sir James Craig. Nevertheless, Londonderry's Education Act of 1923 received little in the way of goodwill from either Protestant or Catholic educational interests and was amended to the point that its purpose, to secularise schooling in Northern Ireland, was lost.

In 1926, he resigned from the Government of Northern Ireland and, in 1929, he left the Parliament of Northern Ireland entirely. He was to involve himself in the General Strike of 1926, playing the role of a moderate mine owner, a stance made easier for him by the relative success of the Londonderry mines in County Durham. His performance earned him high praise, and along with the Londonderrys' role as leading political hosts, he was rewarded by Prime Minister Stanley Baldwin with a seat in the Cabinet in 1928 as First Commissioner of Works. Londonderry was invited to join the emergency National Government under Prime Minister Ramsay MacDonald and Lord President Baldwin in 1931. That was the cause of some scandal as MacDonald's many critics accused the erstwhile Labour leader of being too friendly with Edith, Lady Londonderry.

When the National Government won the 1931 General Election he returned to the Cabinet as Secretary of State for Air (Londonderry held a pilot's licence). This position became increasingly important during his tenure, not least due to the deliberations of the League of Nations Disarmament Conference at Geneva. In September 1931, Japan seized the Manchuria region of China, setting up the sham state of Manchukuo while making claims to the effect that the rest of China was in the exclusive Japanese sphere of influence, an interpretation that the Chinese government vehemently objected to. In January 1932, the First Battle of Shanghai began that saw the Japanese bomb much of Shanghai into rubble.[27] The scenes of Shanghai in flames together with the increasingly assertive Japanese claims about China and the Far East in general as within its sphere of influence convinced Londonderry that Britain needed a strong Royal Air Force as the best way to deter Japan from attacking the British empire and to ensure that Britain was prepared for war should Anglo-Japanese relations take a turn for the worse.[28]

Londonderry toed the British government's equivocal line on disarmament but opposed in Cabinet any moves that would risk the deterrent value of the Royal Air Force. He was thus attacked by Clement Attlee and the Labour Party and became a liability to the National Government. In the spring of 1935, he was removed from the Air Ministry but retained in the Cabinet as Lord Privy Seal and Leader of the House of Lords. Combined with his role as a leading member of the Anglo-German Fellowship, he attracted the popular nickname of "Londonderry Herr".[29]

The sense of hurt Lord Londonderry felt at that and accusations that he had misled Baldwin about the strength of Nazi Germany's Luftwaffe led him to seek to clear his reputation as a 'warmonger' by engaging in amateur diplomacy. The British historian Richard Griffiths made a distinction between appeasers, a term that he reserved for government officials who believed in appeasement of the Axis states for a variety of reasons, many quite pragmatic, and the enthusiasts for Nazi Germany, which he described a group of individuals who acting on their own as private citizens sought better relations with the Third Reich, usually for ideological reasons.[30] Griffins defined Londonderry as an enthusiast for Nazi Germany, instead of an appeaser, by noting that after June 1935, Londonderry was speaking mostly for himself when he sought out the company of Nazi leaders.[31] Londonderry joined the Anglo-German Fellowship, a society that sought to bring together elites from Britain and Germany with the aim of forging an Anglo-German alliance.[32]

As part of his work as an amateur diplomat, that involved Londonderry making visits to meet Hitler, Hess, Goering, Himmler, von Papen and other senior members of the German government Between January 1936 and September 1938, Londonderry made six visits to Nazi Germany, the first lasting for three weeks, but a seventh invitation that had been accepted for March 1939 was abruptly declined by Londonderry after the Nazi occupation of Prague. From early 1936 onward, Londonderry's public statements about the Third Reich became markedly admiring and sympathetic.[33] In March 1936, Leopold von Hoesch, the German ambassador in London in a report to Berlin called Londonderry "one of those on whom the German government relied for the right opinions".[34] As part of his amateur diplomacy, Londonderry invited in 1936 Joachim von Ribbentrop, the German Ambassador to the Court of St. James's, later the German foreign minister, to two visits at the principal ancestral homes of the Marquess in Northern Ireland and England. They came to Mount Stewart on 29 May to 2 June and were at Wynyard Hall on 13–17 November and for subsequent briefings with government officials in London.

During the first two visits, prior to the abdication of Edward VIII, whom the Nazis assessed as a supporter, Londonderry was considered an aristocrat of real influence by Hitler. The friendly regard in which Londonderry was held in Berlin was reflected in Hitler indiscreetly informing his guest, in October 1936, of his intended moves both on Czechoslovakia and Poland, years before two invasions happened.[35]

Although Londonderry immediately passed that information regarding Hitler's indicated future direction of German policy on to a member of the British government by a letter to Lord Halifax on 24 December 1936,[36] rearmament was not notably accelerated in Britain. In the end, Londonderry's high-profile promotion of Anglo-German friendship marked him with a far greater slur than what had led him to engage in appeasement in the first place.

Under attack from anti-Nazis inside and outside Westminster, Lord Londonderry attempted to explain his position by publishing Ourselves and Germany in March 1938. Then, after the Munich agreement, in October 1938, Londonderry wrote in a letter that he was aware that Hitler was "gradually getting back to the theories which he evolved in prison", when working on Mein Kampf. Londonderry's work was openly antisemitic, declaring: “I have no great affection for the Jews...it is possible to trace their participation in most of the international disturbances which have created so much havoc in different countries.”[37]

December 1939: Honorary Air Commodore Lord Londonderry (centre) looks on as Air Chief Marshal Sir Cyril Newall, Chief of the Air Staff, inspects an aircraft in France.

After playing a marginal role in the resignation of Neville Chamberlain as Prime Minister in 1940, he failed to win any favour from the new Prime Minister, Winston Churchill (his second cousin), who thought little of his talents. Out of office during the war, he produced his memoirs, Wings of Destiny (1943), a relatively short book that was considerably censured by some of his former colleagues.

Lord Londonderry served as Lord Lieutenant of County Down between 1915 and 1949 and of County Durham between 1928 and 1949 and was Chancellor of the University of Durham and The Queen's University of Belfast. He was Mayor of Durham during the year of George VI's Coronation (1937). He was sworn of the Irish Privy Council in 1918 and of the Imperial Privy Council in 1925[38] and appointed a Knight of the Garter in 1919.[39]

On 28 November 1899, Lord Londonderry married the Hon. Edith Helen Chaplin, eldest daughter of Henry Chaplin, 1st Viscount Chaplin, and Lady Florence Sutherland-Leveson-Gower (herself a daughter of the 3rd Duke of Sutherland) at St Peter's Church, Eaton Square and had issue:

• Lady Maureen Helen Vane-Tempest-Stewart (1900–1942), who married in 1920 the Hon. Oliver Stanley and had issue: (i) Michael Charles Stanley (1921–1990), who married (Aileen) Fortune Constance Hugh Smith and had two sons; and (ii) Kathryn Edith Helen Stanley DCVO (1923–2004), Lady-in-Waiting to Queen Elizabeth II from 1955 to 2002 and who married Sir John Dugdale KCVO (1923–1994) and had two daughters and two sons.
• Edward Charles Stewart Robert Vane-Tempest-Stewart, 8th Marquess of Londonderry (1902–1955)
• Lady Margaret Frances Anne Vane-Tempest-Stewart (1910–1966), who married in 1934 (div. 1939) Frederick Alan Irving Muntz and in 1952 (div.1958) as his 3rd wife, Hugh Falkus (1917–1996).
• Lady Helen Maglona Vane-Tempest-Stewart (1911–1986), who married in 1935 Edward Jessel, 2nd Baron Jessel, and had issue: (i) Hon. Timothy Edward Jessel (1935–1969) who married twice and had issue; (ii) Hon. Camilla Edith Mairi Elizabeth Jessel (b. 1940) who was married and has issue; and (iii) Hon. Joanna Margaret Jessel (1945-1980) who was married and had issue.
• Lady Mairi Elizabeth Vane-Tempest-Stewart (1921–2009), who married in 1940 (div. 1958) Derek William Charles Keppel, Viscount Bury (1911–1968), eldest son of Walter Keppel, 9th Earl of Albemarle and had issue: (i) Lady Elizabeth Mairi Keppel (1941–2014) who married in 1962 (div.) Alastair Michael Hyde Villiers (1939–2005) and has issue, and in 1980 (div. 1988) Merlin Hanbury-Tracy, 7th Baron Sudeley; and (ii) Lady Rose Deirdre Margaret Keppel (b. 1943) who married Peter Lathrop Lauritzen and has issue.

Lord Londonderry had an illegitimate daughter with actress Fannie Ward, named Dorothé Mabel Lewis [b.1900]. She first married, in 1918, a nephew of mining magnate Barney Barnato, Capt. Jack Barnato, who died of pneumonia shortly after their wedding. Her second husband, whom she married in 1922, was Terence Plunket, 6th Baron Plunket, and with him she had three sons: Patrick Plunket, 7th Baron Plunket, Robin Plunket, 8th Baron Plunket, and the Hon Shaun Plunket. Lord and Lady Plunket were killed in an aircraft crash in California in 1938.

Having suffered a stroke after a gliding accident a few years after the end of the war, Lord Londonderry died on 10 February 1949 at Mount Stewart, County Down, aged 70.[40]

• Fleming, Neil C. "Aristocratic appeasement: Lord Londonderry, Nazi Germany, and the promotion of Anglo-German misunderstanding." Cardiff Historical Papers (2007). online
• Fleming, Neil C. "Lord Londonderry and education reform in 1920s Northern Ireland", History Ireland (spring 2001) ·
• Fleming, Neil C. The Marquess of Londonderry: Aristocracy, Power and Politics in Britain and Ireland. (London, 2005)
• Griffiths, Richard. Fellow Travellers of the Right: British Enthusiasts for Nazi Germany, 1933–9 (Constable, 1980)
• Hyde, H. Montgomery. British air policy between the wars, 1918–1939 (1976) ·
• Hyded, H. Montgomery. The Londonderrys: A Family Portrait. (London, 1979)
• Jackson, Alvin. "Stewart, Charles Stewart Henry Vane-Tempest-, seventh marquess of Londonderry (1878–1949)", Oxford Dictionary of National Biography, Oxford University Press, 2004; online edn, Jan 2008 accessed 6 Jan 2016
• Kershaw, Ian. Making Friends with Hitler: Lord Londonderry and the British Road to War. (London, 2004)
• Strobl, Gerwin. The Germanic Isle: Nazi Perceptions of Britain (Cambridge University Press, 2000)

• Hansard 1803–2005: contributions in Parliament by the Marquess of Londonderry
• Newspaper clippings about Charles Vane-Tempest-Stewart, 7th Marquess of Londonderry in the 20th Century Press Archives of the ZBW
• "Londonderry, Marquess of" . Thom's Irish Who's Who . Dublin: Alexander Thom and Son Ltd. 1923. p. 139  – via Wikisource.