Alyss was an ugly woman, but because of her locks of golden hair, people ignored her ugliness and fawned over her. One day, a Topaz dragon abducted her so that her hair could line its nest. Rosnan, a man who was in love with Alyss, tried to rescue her, but was no match for the dragon. Before it could kill him. Alyss cut off her own hair in exchange for Rosnan's life.
When Alyss saw how ugly she was without her hair, she fled deep underground in disgust. She eventually made her way into the Pirran Caverns, and stopped at the island of Keras. Rosnan chased after her and confessed that he loved her despite her ugliness and the people of Keron let them live on the island together.
The story of Alyss and Rosnan was recorded in the Deltora Annals as one of the Tenna Birdsong Tales. Lief and Jasmine both read the story when the Annals were recovered, and used it to decipher the location of the Pirran Sea.
When Lief, Barda, and Jasmine arrived on Keran, the Kerons explained that Alyss and Rosnan's children married Kerons, and so most modern Kerons have some Deltoran blood in them. Emlis, the son of the piper Tirral, even has golden hair like Alyss.
Very little is known about Alyss' personality. She was described as being vain and caring only about beauty, as the sight of her ugliness when she cut off her golden hair was enough to make her flee underground, into the Pirran caverns in disgust. However, she was not too vain to reject the love of Rosnan because of his ugly appearance.