Leontes
Background
Leontes is a knight in Britain. He is engaged to Guinevere.
During the events of Camelot, Season 1 Episode 1 Homecoming played by Philip Winchester
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.
During the events of Camelot, Season 1 Episode 2 The Sword and the Crown played by Philip Winchester
Arthur and Kay mourn at the casket of Arthur's Foster Mother. As Leontes and Ulfius are about to close her tomb, Arthur starts to blame himself for her death. Merlin tells him that Lot murdered her so Arthur would give up. Arthur tells the others to leave while he stays to mourn. In the morning, Arthur, Kay, Merlin and Leontes go to where a sword is stuck inside the top of a waterfall. Merlin tells the legend of the sword, that whoever pulls it from the stone shall be the king to reunite Britain. Kay throws a rope over a stump jutting out of the cliff and ties the other end around Arthur.
A Naysayer tells Merlin that Kay pulling Arthur up the waterfall is cheating. Leontes tells Merlin that even if Arthur pulls the sword, there is no way for him to come back down safely. More people gather to watch Arthur's attempt and the Naysayer says that Arthur will fail. Arthur makes it to the sword and pulls the sword out, but then falls to the lake below. Leontes pulls him from the lake, but Arthur is unconscious. Merlin tells Leontes to light the beacon and to tell everyone that Arthur has retrieved the sword. After he recovers, Arthur has his coronation ceremony and the Archbishop crowns Arthur king. Kay is made marshal of England, and Ector and Leontes are made champions. Arthur and Guinevere walk to the edge of the castle and while they are talking, Leontes joins them and Arthur finds out that Guinevere and Leontes are engaged. Arthur walks back into the castle and notices suspicious men in hoods and a battle breaks out. Pellinor is killed by Lot who then fights Ector. Lot fatally stabs Ector, who then sticks a dagger through Lot's neck.
During the events of Camelot, Season 1 Episode 3 Guinevere played by Philip Winchester
Leontes walks up to Arthur in a hurry and then takes him to see Guinevere and Bridget. Leodegrance tells Arthur about the bandit attack and Leontes asks if they can stay at Camelot. Merlin says no, but Arthur says they can stay. Leodegrance mentions Guinevere and Leontes' upcoming marriage and Merlin insists they have the wedding at Camelot. Leontes tells Kay that they should recruit Gawain to boost morale. Kay and Leontes find Gawain in an old church and they initially fight each other. They tell him about Arthur defeating Lot and pulling the sword from the stone. As Kay and Leontes are leaving, Gawain offers to join them if Kay teaches him how to read. Arthur presides over Guinevere and Leontes' wedding. After the wedding, Guinevere and Leontes have sex and he notices she bled.