King Arthur is a 2004 action adventure film directed by Antoine Fuqua and written by David Franzoni. It stars Clive Owen as the title character, Ioan Gruffudd as Lancelot and Keira Knightley as Guinevere.
The film is unusual in reinterpreting Arthur as a Roman officer rather than a medieval knight. Despite these departures from the source material, the Welsh Mabinogion, the producers of the film attempted to market it as a more historically accurate version of the Arthurian legends, supposedly inspired by new archaeological findings. The film was shot in England, Ireland and Wales.
Arthur (Clive Owen) is portrayed as a Roman cavalry officer, also known as Artorius Castus, the son of a Roman father and a Celtic mother, who commands a unit of Sarmatian auxiliary cavalry in Britain at the close of the Roman occupation in 467 A.D. Arthur is loyal to Rome and a devout Catholic, but follows the teachings of Pelagianism, which many consider heretical. He and his men guard Hadrian's Wall against the Woads, a group of native Britons who are rebels against Roman rule, led by the mysterious Merlin (Stephen Dillane).