Diodorus Siculus 10.29.1
Gelon of Syracuse cried out in his sleep, for he was dreaming that he had been struck by lightning, and his dog, when he noticed that he was crying out immoderately, did not stop barking until he awakened him. Gelon was also once saved from death by a wolf. As a boy he was seated in a school and a wolf came and snatched away the tablet he was using. And while he was chasing after the wolf itself and his tablet too, the school was shaken by an earthquake and crashed down from its very foundations, killing every one of the boys together with the teacher. Historians, like Timaeus, Dionysius, Diodorus, and also Dio, celebrate the number of the boys, which amounted to more than one hundred. The precise number I do not know.