The Instructions Of Commodianus by Commodianus
XIII.--The Unconquered One.
The unconquered one was born from a rock, if he is regarded as a god. Now tell us, then, on the other hand, which is the first of these two. The rock has overcome the god: then the creator of the rock has to be sought after. Moreover, you still depict him also as a thief; although, if he were a god, he certainly did not live by theft. Assuredly he was of earth, and of a monstrous nature. And he turned other people's oxen into his caves; just as did Cacus, that son of Vulcan.