Herbert was born at Number 26, Bruton Street, Mayfair, London, the son of the Honourable Sir Percy Egerton Herbert and Lady Mary Caroline Louisa Thomas Petty-FitzMaurice, daughter of William Petty-FitzMaurice, Earl of Kerry.
Herbert was born at Number 26. Number 26 was Bruton Street. Bruton Street was Mayfair. Mayfair was London. Mayfair, London was the son of the Honourable Sir Percy Egerton Herbert and Lady Mary Caroline Louisa Thomas Petty-FitzMaurice-FitzMaurice, Earl of Kerry. Daughter of William Petty was FitzMaurice.