Tillendal Tirraso was a clerk during the Age of Legends.
After Demandred founded the Eighty and One, he confronted Lews Therin Telamon in battle. Tillendal was present and was struck by lightning called down by the enemy. Lews Therin apparently watched her die with her blood on his hands.
Tillendal is mentioned in a foretelling given by an Aes Sedai of King Paitar Nachiman's own family line. When the Dragon is reborn, the Borderland kings and queens must travel to him and question him for knowledge about how Tellindal died. If the Dragon Reborn answers correctly, they will follow him, but if he does not, they must strike him down on the spot and they must enjoy what they can as the world shall die.