Trophonius is said to have been a son of Apollo, not of Erginus. This I am inclined to believe, as does everyone who has gone to Trophonius to inquire of his oracle. They say that these, when they grew up, proved clever at building sanctuaries for the gods and palaces for men. For they built the temple for Apollo at Delphi
and the treasury for Hyrieus. One of the stones in it they made so that they could take it away from the outside. So they kept on removing something from the store. Hyrieus was dumbfounded when he saw keys and seals untampered with, while the treasure kept on getting less.