Here are some of his notable works:
* The Great White Queen (1933)
* The Prince of Darkness (1937)
* The Daughter of the Nile (1939)
* The Shield of the Legion (1940)
* The Emperor's Lady (1941)
* The Serpent's Tooth (1943)
* The Last Gladiator (1944)
* The White Legion (1946)
* The Silver Galleon (1947)
* The Eagle of the Ninth (1954)
* The Gods of the North (1957)
* The Shadow of the Eagle (1959)
* The Lion's Skin (1962)
His novels are known for their detailed historical accuracy, vivid descriptions of ancient life, and engaging plots that capture the spirit of the Roman Empire.