Question: Robert Collier, 2nd Baron Monkswell was briefly Under-Secretary of State for War under a man who was known by the courtesy title of?

full_context: Document 1: J. E. B. Seely, 1st Baron Mottistone: Major General John Edward Bernard Seely, 1st Baron Mottistone (31 May 1868 – 7 November 1947) was a British Army general and politician. He was a Conservative Member of Parliament (MP) from 1900 to 1904 and a Liberal MP from 1904 to 1922 and from 1923 to 1924. He was Secretary of State for War for the two years prior to the First World War, before being forced to resign as a result of the Curragh Incident. As General Jack Seely, he led one of the last great cavalry charges in history at the Battle of Moreuil Wood on his war horse Warrior in March 1918. Seely was a great friend of Winston Churchill and the only former cabinet minister to go to the front in 1914 and still be there four years later.
Document 2: Barnbougle Castle: Barnbougle Castle is a much-altered tower house on the southern shore of the Firth of Forth, between Cramond and Queensferry, and within the parish of Dalmeny. It lies within the Earl of Rosebery's estate, just northwest of Dalmeny House. Although its history goes back to the 13th century, the present castle is the result of rebuilding in 1881 by the 5th Earl of Rosebery, who served as Prime Minister from 1894–1895.
Document 3: List of Prime Ministers of the United Kingdom: The Prime Minister of the United Kingdom is the head of the Government of the United Kingdom, and chairs Cabinet meetings. There is no specific date when the office of Prime Minister first appeared, as the role was not created but rather evolved over a period of time. The term was used in the House of Commons in 1805 and it was certainly in parliamentary use by the 1880s, and in 1905 the post of Prime Minister was officially given recognition in the order of precedence. Modern historians generally consider Sir Robert Walpole, who led the government of Great Britain from 1721 to 1742, as the first Prime Minister. Walpole is also the longest-serving Prime Minister by this definition. However, Sir Henry Campbell-Bannerman was the first Prime Minister and Margaret Thatcher the longest-serving Prime Minister to have been officially referred to as such.
Document 4: Baron Monkswell: Baron Monkswell, of Monkswell in the County of Devon, is a title in the Peerage of the United Kingdom. It was created in 1885 for the lawyer and Liberal politician Sir Robert Collier. His eldest son, the second Baron, served as Under-Secretary of State for War in 1895 in the Liberal administration of Lord Rosebery. His grandson, the fourth Baron (who succeeded his uncle in the title), disclaimed the peerage on 7 April 1964. He had earlier been a member of the Essex County Council. s of 2010 the title is held by his eldest son, the fifth Baron, who succeeded in 1984. He was previously a member of the Manchester City Council for the Labour Party.
Document 5: Robert Collier, 1st Baron Monkswell: Robert Porrett Collier, 1st Baron Monkswell, PC, QC (21 June 1817 – 27 October 1886) was an English lawyer, politician and judge.
Document 6: Mervyn Herbert: The Honourable Mervyn Robert Howard Molyneux Herbert (27 December 1882 – 26 May 1929) was a career diplomat and a first-class cricket player. He was born at Highclere Castle, Hampshire and he died at the British Embassy, Rome.
Document 7: Robert Collier, 2nd Baron Monkswell: Robert Collier, 2nd Baron Monkswell (26 March 1845 – 22 December 1909), was a British Liberal politician. He was briefly Under-Secretary of State for War under The Earl of Rosebery in 1895. As a young man, he was a first-class cricketer active from 1866 to 1867. He was born and died in Chelsea.
Document 8: John Russell, 7th Earl Russell: John Francis Russell, 7th Earl Russell, is a Liberal Democrat politician. He was born in 1971, the son of Conrad Russell, 5th Earl Russell, grandson of Bertrand Russell and great-great-grandson of John Russell, 1st Earl Russell, who was Prime Minister of the United Kingdom from 1864 to 1865. He succeeded to the earldom on the death of his brother Nicholas Russell, 6th Earl Russell, on 17 August 2014.
Document 9: Harold Macmillan: Maurice Harold Macmillan, 1st Earl of Stockton, {'1': ", '2': ", '3': ", '4': "} (10 February 1894 – 29 December 1986) was a British statesman of the Conservative Party who served as Prime Minister of the United Kingdom from 1957 to 1963. Nicknamed "Supermac", he was known for his pragmatism, wit and unflappability.
Document 10: John Russell, 1st Earl Russell: John Russell, 1st Earl Russell, (18 August 1792 – 28 May 1878), known as Lord John Russell before 1861, was a leading Whig and Liberal politician who served as Prime Minister on two occasions during the mid-19th century. Scion of one of the most powerful aristocratic families, his great achievements, says A. J. P. Taylor, were based on his indefatigable battles in Parliament over the years on behalf of the expansion of liberty; after each loss he tried again and again, until finally his efforts were largely successful. E. L. Woodward, however, argued that he was too much the abstract theorist, so that "He was more concerned with the removal of obstacles to civil liberty than with the creation of a more reasonable and civilised society". Nevertheless Russell led his Whig Party into support for reform; he was the principal architect of the great Reform Act of 1832. As Prime Minister his luck ran out. He headed a government that failed to deal with a famine in Ireland that caused the loss of a quarter of its population. Taylor concludes that as prime minister, he was not a success. Indeed, his Government of 1846 to 1852 was the ruin of the Whig party: it never composed a Government again, and his Government of 1865 to 1866, which might be described as the first Liberal Government, was very nearly the ruin of the Liberal party also.
Document 11: George Curzon, 1st Marquess Curzon of Kedleston: George Nathaniel Curzon, 1st Marquess Curzon of Kedleston (11 January 1859 – 20 March 1925), known as The Lord Curzon of Kedleston between 1898 and 1911 and as The Earl Curzon of Kedleston between 1911 and 1921, was a British Conservative statesman.
Document 12: Arthur Collins (courtier): Arthur Collins CB, MVO, Commander, Hohenzollern Order (26 June 1845 – 21 November 1911), was Equerry and Comptroller for Princess Louise, Queen Victoria's 4th daughter and Gentleman Usher in the households of Queen Victoria and King Edward VII. He attended Princess Louise in her role as the wife of John Campbell, 9th Duke of Argyll (at that time Marquis of Lorne), who was Governor General and Vice Regent of Canada between 1878 and 1883. Collins represented Princess Louise at the funerals of Lord Beaconsfield, Benjamin Disraeli, and William Ewart Gladstone, the two competing Prime Ministers during Queen Victoria's reign. Collins attended as a Gentleman Usher the coronation of King Edward VII and probably Victoria's funeral.
Document 13: Archibald Primrose, 5th Earl of Rosebery: Archibald Philip Primrose, 5th Earl of Rosebery, 1st Earl of Midlothian, (7 May 1847 – 21 May 1929) was a British Liberal statesman who served as Prime Minister of the United Kingdom from 5 March 1894 to 22 June 1895. Between the death of his father, in 1851, and the death of his grandfather, the 4th Earl, in 1868, he was known by the courtesy title of Lord Dalmeny.
Document 14: Anthony Eden: Robert Anthony Eden, 1st Earl of Avon, (12 June 1897 – 14 January 1977) was a British Conservative politician who served three periods as Foreign Secretary and then a relatively brief term as Prime Minister of the United Kingdom from 1955 to 1957.
Document 15: Robert Collier, 3rd Baron Monkswell: Robert Alfred Hardcastle Collier, 3rd Baron of Monkswell (13 December 1875 – 14 January 1964), known as Robert Collier before 1909, was a British aristocrat and writer on railways.
ground_truth: Lord Dalmeny