

Cox had two younger siblings: Stephen Henry Johnson Cox (1899–1960), who became a schoolmaster, and Cynthia Cicely Cox (born 1897).

His paternal grandfather was a Derby wine merchant.

Monmouth Platts.Īnthony Berkeley Cox was born 5 July 1893 at Watford, son of medical practitioner Dr Alfred Edward Cox (1861–1936), of Monmouth House and The Platts, two adjoining properties on Watford High Street, and Sybil Maud (died 1924), née Iles, who ran a school at Monmouth House. He wrote under several pen-names, including Francis Iles, Anthony Berkeley and A. Monmouth PlattsĪnthony Berkeley Cox (5 July 1893 – 9 March 1971) was an English crime writer.
