Iggulden was born in 1971. He attended St.Martins School in Northwood before moving on to Merchant Taylors' School. He studied English at the University of London, and went on to teach the subject for seven years - becoming head of the English department at St Gregory's Roman Catholic School in London. He eventually left teaching to write his first novel, The Gates of Rome. He is married with three children and lives in Hertfordshire, England.
His writing influences include universally acclaimed historical novelists like Patrick O'Brian, David Gemmell, Bernard Cornwell, George MacDonald Fraser, Wilbur Smith and C. S. Forester. Iggulden is also a lover of poetry, and his favourites include If by Rudyard Kipling.