Uriens is a knight in Britain.
During the events of Camelot: Season 1 Episode 1 Homecoming played by Joe Doyle
King Arthur, Merlin and Kay arrive at Camelot and they walk into the great hall of Camelot and meet the warriors who have sworn allegiance to Arthur, Ulfius, Leontes, Brastias, and Pellinor among others including Uriens. Leontes tells Arthur that King Uther was a great man and they give their loyalty to him. King Lot and Morgan arrive at the castle and Morgan denies that Arthur is Uther's son. Queen Igraine walks into the hall and says that Arthur is her and Uther's son and Lot and Morgan leave. Morgan, Lot, Scotland and others arrive with their armies and Morgan tells Arthur to leave or he will lose everything. Arthur demands their allegiance and respect and Lot has the body of Lot's Outrider brought into the hall and tells Arthur that the Outrider was his eldest son. Arthur's Foster Mother is brought into the hall and Lot stabs her dead. Lot tells Arthur that he has five days or his family and friends will be slaughtered.