Vere Ponsonby, 9th Earl of Bessborough

Ponsonby was born in London, the first son and third child of Edward, 8th Earl of Bessborough, and his wife Blanche. Her father, Sir Josiah Guest, was a great-uncle of Sir Winston Churchill. Ponsonby attended Harrow School before going up to Trinity College, Cambridge, in 1898, graduating three years later with a Bachelor of Arts degree. In 1903, he began a career in law, being called to the Bar at the Inner Temple. After his father succeeded as Earl of Bessborough in 1906, Ponsonby used the courtesy title of Viscount Duncannon.

In 1907, the young Viscount Duncannon (as he then was) entered politics, being elected to a seat on the London County Council. He remained at that post until running in the January 1910 general election and winning a seat in the British House of Commons as the Member of Parliament (MP) for Cheltenham. He lost that seat in the election of 19 December that same year, but re-entered the Commons in 1913 as the MP for Dover.

When the First World War broke out and, while retaining his parliamentary seat, Lord Duncannon joined the army. He was commissioned as a second lieutenant in Royal Buckinghamshire Yeomanry. On 11 November 1914, he transferred to the Suffolk Hussars (both units were part of the Territorial Force and were sent into action overseas), where he was later appointed captain and promoted to acting major. He served at Gallipoli in 1915 and, from 1916 to 1918, on the military staff in France. During his wartime service, he was mentioned in dispatches, awarded the Croix de chevalier of the French Legion of Honour, and appointed to the Italian Order of St Maurice and St Lazarus, the Belgian Order of Leopold II, Greece's Order of the Redeemer, as well as a Third Class Member of the Russian Order of St Anna. After the war, Lord Duncannon was appointed a Companion of the Order of St. Michael and St. George in the 1919 New Year Honours List.

After the death of his father on 1 December 1920, he succeeded to the Irish earldom of Bessborough, requiring him to resign his seat in the House of Commons and enter the House of Lords. On 17 December, he applied to be Crown Steward and Bailiff of the Three Hundreds of Chiltern. The Earl had a successful business career, holding directorships in several large commercial firms, including acting as head of both the São Paulo Railway and the Margarine Union, as well as deputy chairman of De Beers Consolidated Mines. On 8 April 1925 his ten-year-old second son, D. N. Ponsonby, was thrown from a horse and killed while riding at Stansted Park.