Ab urbe condita
Titus Livius (Livy)
Livy. History of Rome, Volumes 1-2. Roberts, Canon, Rev, translator. London, New York: J. M. Dent and Sons; E. P. Dutton and Co., 1912.
The Alban Lake rose to an unusual height, without any rainfall or other cause which could prevent the phenomenon from appearing supernatural. Envoys were sent to the oracle of Delphi to ascertain why the gods sent the portent.
But an explanation was afforded nearer at hand.
An aged Veientine was impelled by destiny to announce, amidst the jeers of the Roman and Etruscan outposts, in prophetic strain, that the Romans would never get possession of Veii until the water had been drawn off from the Alban Lake. This was at first treated as a wild utterance, but afterwards it began to be talked about.
Owing to the length of the war, there were frequent conversations between the troops on both sides, and a Roman on outpost duty asked one of the townsmen who was nearest to him who the man was who was throwing out such dark hints about the Alban Lake.
When he heard that he was a soothsayer, being himself a man not devoid of religious fears, he invited the prophet to an interview on the pretext of wishing to consult him, if he had time, about a portent which demanded his own personal expiation.