He was styled Viscount Wallingford until 1813, when his father's claim to the Earldom of Banbury was rejected.

[1] Knollys was commissioned into the 3rd Foot Guards in 1813 and fought in the Peninsular War later that year.

[2] In 1862 he was appointed Treasurer and Comptroller to the Household of Prince of Wales, later King Edward VII.

[1] He was promoted to full General on 17 June 1866 and made a Knight Commander of the Order of the Bath (KCB) in 1867.

[4] Another son, Sir Henry Knollys (1840–1930), became private secretary to King Edward's daughter Maud, Queen of Norway.