> Morgana La Fey was not the Lady of the Lake. She was Merlin’s nemesis, and, by extension, Arthur’s.
In the Song of Roland, Morgana Le Fe (Morgan the Fairy() was Merlin’s lover and also the Lady of the Lake. Arthur was not mentioned as an active character in the story. Have you read the Song of Roland? Roland was a Paladin (Knight) in the service of Charlemagne during the time Charlemagne was driving the Moors out of Europe.
I base my statement on Malory's accounting of the legend, "Le Morte d'Arthur," in which Morgana is reputedly the half-sister of Arthur and his arch-enemy. She does at one time have possession of Excalibur, but she does not give it to Arthur.
The Lady of the Lake, on the other hand, is Arthur's protector, a mysterious water spirit sometimes called "Vivien," who gives him not only Excalibur, but its scabbard, which has the power to protect him from mortal harm. Morgana steals the scabbard and throws it into the lake, thus rendering Arthur liable to injury, which he receives in battle with Mordred.
Though sometimes confused, Morgana and Vivien are not the same person.