Natural son of the daughter of a despised tanner from Falaise, Guillaume is, at the age of 7, recognized by his father, the Duke of Normandy, Robert the Magnificent, also called "the Devil" for murdering his brother to take the crown of Normandy.

The Duke of Normandy Robert the Magnificent, murdered his brother Richard to take the crown. Edouard, his uncle, a refugee in Normandy, is heir to the throne of England. On his advice. Robert abdicated in favor of his son William, born of his affair with Ariette de Falaise, before going to die in the Holy Land. William is challenged by both the Norman barons and the King of France.

William is in love with Edith at the gooseneck, who is seduced by Harold, son of Godwin, mayor of the Palace of the Kingdom of England. However. Edward became King of England under the name of Edward the Confessor. William, after his stay in England with Edouard must, once again, crush the rebellion of the powerful Norman barons. He succeeds with the involuntary help of his former enemy, the King of France.

During the three years of the siege of Brionne, William has shared his life with a young woman, Guinevere. She is considered by the mother of William's as an obstacle to the greatness of his son. Guinevere is taken away from him. By reason of State, William marries Princess Mathilde, daughter of the powerful and wealthy Duke of Flanders. He repels enemy invasions. Feeling his imminent death, Edouard sends a secret message, which only William can decipher.

Harold is commissioned by Edward the Confessor to deliver the secret message to William. Side by side, they become friends. William and Harold support jousts and wars, so that William reveals to Harold the promise he made to Edward to succeed him. William also offers Harold to give him his daughter in marriage ...