 This 1,500 year old monumental grave is dedicated to the Tuareg matriarch Tin Hinan, and vestiges of a Tifinagh inscription have been found on one of its walls.According to Henri Lhote, the edifice may have built on top of an earlier Roman castrum since its architecture is different from the surrounding tombs and similar to that used by the Roman legionaries to construct their desert fortifications.On 18 October 1927 Byron Khun de Prorok, discovered a vault near Abalessa containing a skeleton, belonging to a woman, and her furniture.