<Ul> <Li> Charlie Hunnam as King Arthur, Uther's son, Vortigern's nephew and the would - be king of Britain who was raised by prostitutes . </Li> <Li> Àstrid Bergès - Frisbey as the Mage, a woman working for Merlin who supports Arthur and the resistance . </Li> <Li> Djimon Hounsou as Sir Bedivere, the leader of the resistance and a former knight of Uther . </Li> <Li> Aidan Gillen as Goosefat Bill, a skilled archer, Bedivere's friend, former knight of Uther and member of the resistance . </Li> <Li> Jude Law as Vortigern, Uther's brother, Elsa's husband, Catia's father, Arthur's uncle and the tyrannical ruthless king of Britain . </Li> <Li> Eric Bana as Uther Pendragon, Vortigern's brother, Arthur's father and the king of Britain . </Li> <Li> Kingsley Ben - Adir as Sir Tristan "Wet Stick", Arthur and Back Lack's childhood friend who is later knighted by Bedivere . </Li> <Li> Craig McGinlay as Sir Percival, a member of the resistance who is later turned knighted by Bedivere . </Li> <Li> Tom Wu as Sir George, Arthur's mentor and a skilled fighter who helps the resistance and is later knighted by Bedivere . </Li> <Li> Neil Maskell as Back Lack, Arthur and Tristan's childhood friend and Blue's father, who helps the resistance . </Li> <Li> Freddie Fox as Rubio, a member of the resistance who later betrays them under torture and helps Vortigern . </Li> <Li> Annabelle Wallis as Maggie, Vortigern's maid who helps the resistance . </Li> <Li> Bleu Landau as Blue, Back Lack's son . </Li> <Li> Mikael Persbrandt as Greybeard, a viking who has deals with Vortigern . </Li> <Li> Poppy Delevingne as Igraine, Arthur's mother and Uther's wife: she is killed by Vortigern in the beginning of the film . </Li> </Ul> <Li> Charlie Hunnam as King Arthur, Uther's son, Vortigern's nephew and the would - be king of Britain who was raised by prostitutes . </Li> <Li> Àstrid Bergès - Frisbey as the Mage, a woman working for Merlin who supports Arthur and the resistance . </Li> <Li> Djimon Hounsou as Sir Bedivere, the leader of the resistance and a former knight of Uther . </Li>

King arthur legend of the sword who was the mage