Britain in AD 43 is ripe for conquest. The Celtic tribes are divided, some of the most powerful have been bought off by Roman gold. Drogo as a young Catuvellauni warrior is keen to resist the invader. He soon learns, however, that the Romans are not like any enemy the Britons have met before. He realises that it will be impossible to defeat them militarily and decides to learn from them so that all that he holds dear can be saved. He obtains agreement from the Roman governor Paulinus that his own tribe will be spared. He must, in return, assist the Roman army to cross the land of the savage Western tribes in Cymbru to root out and destroy the feared and powerful Druids. Before he can deliver any of this, he is betrayed and denounced as a traitor. He is forced into the rebel British camp of Caratacus. He is confused about his future, but when the Celtic goddess Arianrhod reveals herself to him in a dream, she shows him his destiny. With the help of her high priestess and the mystic Arthfael, he sets about creating a Roman British Legion. His courage, leadership and integrity win over both many Celtic warriors as well as some powerful Roman leaders. He must continually strive to mediate between Britons and Romans. When he has almost reached his goal, the arrogant Roman governor Frontinas undermines what he has achieved thus far and nearly destroys his destiny.