Henry Petty-Fitzmaurice
Herbert was born at Number 26, Bruton Street, Mayfair, London, and baptised at St George's, Hanover Square. He was the son of The Hon. Sir Percy Egerton Herbert and Lady Mary Caroline Louisa Thomas Petty-FitzMaurice, daughter of the Earl of Kerry (the eldest son of Henry Petty-Fitzmaurice, 3rd Marquess of Lansdowne). He succeeded his uncle the 3rd Earl in the peerage in 1891.