The answer is "Athena".
As per the
mythographic abridgment Bibliotheke, diverse stories have mentioned the reason
for the blindness of Tiresias, the most direct being that he was essentially blinded by
the gods themselves for uncovering their secrets. An elective story told by the
writer Pherecydes was followed in Callimachus' ballad "The Bathing of
Pallas"; in it, Tiresias was blinded by Athena after he staggered onto her
while she was bathing.
