The Great Imperial War was the conflict between the forces of Triumvirate Holdings and Camp Half-Blood and Camp Jupiter. This is the primary conflict in The Trials of Apollo series.
Pre-War[]
It is known that Triumvirate Holdings was involved in previous wars. During the Second Titan War, Triumvirate Holdings supplied Luke Castellan and the Titan Army with the Princess Andromeda. Then, in the Second Demigod Civil War/Second Giant War, the Triumvirate supplied Octavian with monsters such as cynocephali, as well as providing Camp Jupiter with weapons for the Siege of Camp Half-Blood.