in the tv series Merlin yes he does
Morgan (or Morgana) la Fey was King Arthur's half sister.
Arthur had two half sisters that his mother, Igraine, or Ygerne had with Gorlois, Duke of Cornwall. They were named Morgause, or in some legends Anna, and Morgan le fay, sometimes called Morgana or Morgana le fay.
The Saxons1.According to lore, King Arthur fought twelve decisive battles against the Saxon invaders.2.Mordred
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Later legends say that Arthur had three half-sisters: Morgawse, Elaine (Blasine) and Morgan le Fay. Morgawse had married King Lot of Orkney, Elaine (Blasine) was married to King Nentres of Garlot, while Morgan was wife of King Urien of Gorre, brother of Lot. But Morgan Le Fay was the best known.
If you are asking about King Arthur and his Knights of the Round Table; then his sister's name is Morgana or Morgan La Fey (Morgana the Fairy)
Morgan (or Morgana) la Fey was King Arthur's half sister.
Morgana and Mordred
Morgana and Mordred
It is said that Morgana le Fay sent King Arthur a magical cloak as a peace offering for stealing the Excalibur. It was unknown to King Arthur that it would burn up whoever wore it.
...King Arthur
Arthur had two half sisters that his mother, Igraine, or Ygerne had with Gorlois, Duke of Cornwall. They were named Morgause, or in some legends Anna, and Morgan le fay, sometimes called Morgana or Morgana le fay.
There are many characters with the name Morgana. One of them was a villain in The Little Mermaid II: Return to the Sea. There is also a Morgana in Princess Gwenevere and the Jewel Riders. There is a Merlin character named Morgana and a villainous character named Morgana in Power Rangers: S.P.D.
Lady Morgana was a powerful sorceress and antagonist of King Arthur and Queen Guinevere in the Arthurian legend. She was also know as Morgan Le Fey, Morgane, and Morgaine. She was Arthur's half sister by the same mother. She was first mentioned in Geoffrey of Monmouth's Vita Merlini published around 1150.
In some versions of the legend, King Arthur executed his nephew Mordred for treason after Mordred rebelled against him.
morgan la fey
morgan la fey