A knight from whom Caradoc, one of Arthur's knights, rescued a maiden named Guignier. After their duel, Alardin and Caradoc became friends, and Alardin accompanied Caradoc to Arthur's court.

When Guignier (whom he once loved), wife of Caradoc Briefbras, lost her breast to a serpent when aiding her husbland, Aalardin supplied a magic shield boss which provided a golden breast.

He married Arthur's grand-niece Guigenor. His father was named Guiniacalc.