Question: Maurice Frederick Codner, was a British portrait painter, his portraits include those of which senior British Army officer who served with distinction in both the First World War and the Second World War and, afterwards, as Governor General of Canada, the 17th since Canadian Confederation?

Context paragraphs:
John Vereker, 6th Viscount Gort: Field Marshal John Standish Surtees Prendergast Vereker, 6th Viscount Gort & Two Bars, (10 July 1886 – 31 March 1946) was a senior British Army officer.  As a young officer during the First World War he was decorated with the Victoria Cross for his actions during the Battle of the Canal du Nord.  During the 1930s he served as Chief of the Imperial General Staff (the professional head of the British Army).  He is most famous for commanding the British Expeditionary Force sent to France in the first year of the Second World War, which was evacuated from Dunkirk.  Gort later served as Governor of Gibraltar and Malta, and High Commissioner for Palestine and Transjordan.

List of works by John Buchan: John Buchan, 1st Baron Tweedsmuir {'1': ", '2': ", '3': 'PC GCMG GCVO CH', '4': "} (1875 – 1940) was a Scottish novelist, historian, biographer and editor.  Outside the field of literature he was, at various times, a barrister, a publisher, a lieutenant colonel in the Intelligence Corps, the Director of Information—reporting directly to prime minister David Lloyd George—during the First World War and a Unionist MP who served as Governor General of Canada, the 15th since Canadian Confederation.

Julian Byng, 1st Viscount Byng of Vimy: Field Marshal Julian Hedworth George Byng, 1st Viscount Byng of Vimy (11 September 1862 – 6 June 1935) was a British Army officer who served as Governor General of Canada, the 12th since Canadian Confederation.

Vincent Massey: Charles Vincent Massey {'1': ", '2': ", '3': ", '4': "} (February 20, 1887December 30, 1967) was a Canadian lawyer and diplomat who served as the first Canadian-born Governor General of Canada, the 18th since Canadian Confederation.

Maurice Codner: Maurice Frederick Codner (27 September 1888 – 10 March 1958) was a British portrait painter.  His portraits include those of Athene Seyler (1933), Evelyn Laye (1933), Sir George Robey (1935), Sir George Broadbridge (1937), Lord Alexander of Tunis (1946), Kathleen Ferrier (1946), King George VI (1951), Queen Elizabeth the Queen Mother (1952), Leslie Henson (1952), Gwilym Lloyd-George (1955) and Sir Albert Richardson (1956).

John Dill: Field Marshal Sir John Greer Dill, (25 December 1881 – 4 November 1944) was a senior British Army officer with service in both the First World War and the Second World War.  From May 1940 to December 1941 he was the Chief of the Imperial General Staff (CIGS), the professional head of the British Army, and subsequently in Washington, D.C., as Chief of the British Joint Staff Mission and then Senior British Representative on the Combined Chiefs of Staff (CCS), played a significant role during the Second World War in the formation of the "Special Relationship" between the United Kingdom and the United States.

Alexander Cambridge, 1st Earl of Athlone: Alexander Cambridge, 1st Earl of Athlone (Alexander Augustus Frederick William Alfred George; born Prince Alexander of Teck; 14 April 1874 – 16 January 1957), was a British Army commander and major-general who served as the fourth Governor-General of the Union of South Africa and as Governor General of Canada, the 16th since Canadian Confederation.

Victor Cavendish, 9th Duke of Devonshire: Victor Christian William Cavendish, 9th Duke of Devonshire {'1': ", '2': ", '3': ", '4': "} (31 May 18686 May 1938), known as Victor Cavendish until 1908, was a British politician who served as Governor General of Canada, the 11th since Canadian Confederation.

Charles Gairdner: Lieutenant General Sir Charles Henry Gairdner, {'1': ", '2': ", '3': ", '4': "} (20 March 1898 – 22 February 1983) was a senior British Army officer who later occupied two viceregal positions in Australia.  Born in Batavia (now Jakarta) in the Dutch East Indies, he was brought up in Ireland, and educated at Repton School and the Royal Military Academy, Woolwich, in England.  Having served on active duty during the First World War, in which he sustained a serious wound to his right leg, Gairdner spent time at the Staff College, Camberley in the interwar period, and served as commanding officer of the 10th Royal Hussars, 6th Armoured Division and 8th Armoured Division during the Second World War.  He retired from the army in 1949 and was appointed Governor of Western Australia in 1951, a position in which he served until 1963, when he assumed the role of Governor of Tasmania until 1968.  Gairdner died in Nedlands, at the age of 84, and was awarded a state funeral.

Harold Alexander, 1st Earl Alexander of Tunis: Field Marshal Harold Rupert Leofric George Alexander, 1st Earl Alexander of Tunis (10 December 1891 – 16 June 1969) was a senior British Army officer who served with distinction in both the First World War and the Second World War and, afterwards, as Governor General of Canada, the 17th since Canadian Confederation.

Supporting paragraphs: Maurice Codner Harold Alexander, 1st Earl Alexander of Tunis
Answer: Lord Alexander of Tunis