Briton. The Dark Ages. A land in turmoil. King Uther rules the land, but is constantly at war - defending borders and making allegiances with rogue warlords who declare themselves "kings." One night, his daughter Morgan (Eva Green) unexpectedly arrives at his castle and murders her father.Believing herself to be the heir, she installs herself in her dead father's castle. However her plans are thwarted when it is discovered that Uther has an unknown son Arthur (Jamie Campbell Bower) who is the rightful heir to the throne.