At the end of a succession of civil wars which have weakened the Roman Republic, Caesar proclaims himself dictator for life. However, on March 14, 44 BC, he is assassinated by conspirators in the name of the Republic. Mark Antony, his right arm, succeeds in making of Caesar a martyr and tries to claim his inheritance for himself. But the late Caesar had drawn up a will in which he had declared he adopted his great-nephew Octavian, who will later be renamed Augustus. The latter, without any resources, will achieve the unthinkable : to transform the Republic into an Empire.