Aithusa

Family

 * Kilgharrah (former guardian)

Trivia

 * When the writers learned about the fans debating whether Aithusa healing Morgana had to do with the white and red dragon legend or not, they had mentioned very loosely: "we hoped it was a nice tease..." Although this was never followed up on explained within the show. Many fans regard this as a terrible plot hole. This said, it should be noted that this legend is not a key point of the plot nor should be considered as such.
 * Katie McGrath has stated in an interview that Aithusa is, for her, female, despite being mentioned as "he" in Series 4, although this was never explained or indicated within the show.
 * Aithusa used its breath to forge a sword for Morgana in The Diamond of the Day. In legend, Clarent was the Excalibur's twin sword, used by Mordred to slay Arthur. This legend was referenced in the finale.
 * Although Aithusa is considered as a female by many fans, there has been no whatsoever indication within the show that Aithusa is female. Its gender remains unknown.
 * It was never explained how Aithusa was the 'Light of the Sun'. According to an English-to-Greek dictionary "Light of the Sun" is spelt "αὐγή", which when entered into Google translate, means '"Dawn". ---> EXPLANATION : it comes from the Ancient Greek "αὐγή" which means both, the "light of the sun" and "dawn", as well as: rays, beams; any bright light, as of fire; any gleam on the surface of bright objects, sheen. Whereas its descendant, "αυγή", means: dawn; sunrise, daybreak; (figuratively) beginning, start
 * "Aithūsa" is Greek (Αἰθουσα) for "Hall". Showing no correlation between Aithusa's name and the meaning given by Merlin BBC during the episode 'Aithusa' in season 4. (This show has no correlation to greece at all, it should be referenced to old english)
 * It was never explained how Morgana knew Aithusa's name as the Dragon cannot speak; Merlin and Kilgarrah are the only ones to know Aithusa's name.