Ellua

 was a princess of Europa, and the mother of Peladon of Peladon. She was on the way to the Galactic Federation base on Analyas VII when she crash-landed on Peladon in 3864. She met, fell in love, and married King Kellian. (PROSE: Legacy)

When her son, Peladon, was first placed on the throne, she smiled and put his left hand in Hepesh's and his right hand in Torbis's. Peladon told Jo Grant that his mother taught him all she could of justice, compassion, and love. (TV: The Curse of Peladon)

Behind the scenes
Ellua was unnamed in the TV story. She was first named in the novelisation.