Question: Who is the paternal grandfather of David Carnegie, 10Th Earl Of Northesk?

Knowledge 1: David Carnegie, 10th Earl of Northesk
David John Carnegie, 10th Earl of Northesk (1865 – 1921), a Scottish representative peer, was born the son of Lt.-Col.George Carnegie, 9th Earl of Northesk and Elizabeth GeorginaFrances Elliot on 1 December 1865.He died on 5 December 1921 at age 56.He married Elizabeth Boyle Hallowes, daughter of Maj.-Gen.George Skene Hallowes, on 3 February 1894 and had two children: [SEP] Knowledge 2: George Carnegie, 9th Earl of Northesk
Lieutenant-Colonel George John Carnegie, 9th Earl of Northesk DL (1843 – 1891) was a British nobleman and soldier.He was born the son of William Carnegie, 8th Earl of Northesk and Georgiana Maria Elliot on 1 December 1843.He died on 9 September 1891 at age 47.
Lord Rosehill, as he then was, was commissioned into the 1st Dragoons in 1862, but transferred to the Scots Fusilier Guards as a Lieutenant later the same year.He was promoted Captain in 1866 and Lieutenant-Colonel in 1873.He retired in 1874.He married Elizabeth Georgina Frances Elliot, daughter of Admiral Sir George Elliot and Hersey Susan Sydney Wauchope, on 28 February 1865 and had four children.He rebuilt Longwood House, Hampshire, his main home.The architect was George Devey.
Knowledge 1: George Carnegie, 9th Earl of Northesk
Lieutenant-Colonel George John Carnegie, 9th Earl of Northesk DL (1843 – 1891) was a British nobleman and soldier.He was born the son of William Carnegie, 8th Earl of Northesk and Georgiana Maria Elliot on 1 December 1843.He died on 9 September 1891 at age 47.
Lord Rosehill, as he then was, was commissioned into the 1st Dragoons in 1862, but transferred to the Scots Fusilier Guards as a Lieutenant later the same year.He was promoted Captain in 1866 and Lieutenant-Colonel in 1873.He retired in 1874.He married Elizabeth Georgina Frances Elliot, daughter of Admiral Sir George Elliot and Hersey Susan Sydney Wauchope, on 28 February 1865 and had four children.He rebuilt Longwood House, Hampshire, his main home.The architect was George Devey. [SEP] Knowledge 2: David Carnegie, 11th Earl of Northesk
David Ludovic George Hopetoun Carnegie, 11th Earl of Northesk (24 September 1901 – 7 November 1963) was elected a Scottish representative peer.He was also a skeleton competitor who won a bronze medal at the 1928 Winter Olympics.Carnegie was the son of David Carnegie, 10th Earl of Northesk and Elizabeth Boyle Hallowes.He was born at 6 Hans Crescent, London SW1 and educated at St. Aubyns Preparatory School, Rottingdean and Gresham's School, Holt.He succeeded his father as 11th earl on 5 December 1921 and won a bronze medal in skeleton at the 1928 Winter Olympics.From 1921 to 1923 he was on the supplementary list or reserve of Officers for the Coldstream Guards.On 19 July 1923 he married Jessica Ruth Brown, they divorced in 1928.He then married Elizabeth Vlasto, daughter of Anthony Augustus Vlasto, on 7 August 1929.During the Second World War he served in the Intelligence Corps and was demobilised as a Major in 1945, having finished his war time service at the Intelligence Corps Depot.He later farmed at Beer Farm, Binfield, Bracknell, Berkshire, as well as his parliamentary duties.He died childless in November 1963, and was succeeded by his first cousin John Carnegie, 12th Earl of Northesk.Northesk was one of a group of men who re-founded Reading Society of Model Engineers after WW2.
Knowledge 1: David Carnegie, 10th Earl of Northesk
David John Carnegie, 10th Earl of Northesk (1865 – 1921), a Scottish representative peer, was born the son of Lt.-Col.George Carnegie, 9th Earl of Northesk and Elizabeth GeorginaFrances Elliot on 1 December 1865.He died on 5 December 1921 at age 56.He married Elizabeth Boyle Hallowes, daughter of Maj.-Gen.George Skene Hallowes, on 3 February 1894 and had two children: [SEP] Knowledge 2: David Carnegie, 11th Earl of Northesk
David Ludovic George Hopetoun Carnegie, 11th Earl of Northesk (24 September 1901 – 7 November 1963) was elected a Scottish representative peer.He was also a skeleton competitor who won a bronze medal at the 1928 Winter Olympics.Carnegie was the son of David Carnegie, 10th Earl of Northesk and Elizabeth Boyle Hallowes.He was born at 6 Hans Crescent, London SW1 and educated at St. Aubyns Preparatory School, Rottingdean and Gresham's School, Holt.He succeeded his father as 11th earl on 5 December 1921 and won a bronze medal in skeleton at the 1928 Winter Olympics.From 1921 to 1923 he was on the supplementary list or reserve of Officers for the Coldstream Guards.On 19 July 1923 he married Jessica Ruth Brown, they divorced in 1928.He then married Elizabeth Vlasto, daughter of Anthony Augustus Vlasto, on 7 August 1929.During the Second World War he served in the Intelligence Corps and was demobilised as a Major in 1945, having finished his war time service at the Intelligence Corps Depot.He later farmed at Beer Farm, Binfield, Bracknell, Berkshire, as well as his parliamentary duties.He died childless in November 1963, and was succeeded by his first cousin John Carnegie, 12th Earl of Northesk.Northesk was one of a group of men who re-founded Reading Society of Model Engineers after WW2.

Answer: William Carnegie, 8th Earl of Northesk