Ylon was one of the Ysandir that Alanna and Jonathan defeated along with the other Ysandir still living there when they visited the Black City. Ylon was the chief of the Ysandir and he and Ylanda were the first, oldest and strongest of the Ysandir. Ylon is described as "broad-shouldered and black-bearded, a giant even among these creatures" —description of Ylon when he appeared to Alanna and Johnathan in the Black City