The Odyssey 11.301–315

“And after her I saw Iphimedeia, wife of Aloeus, who declared that she had lain with Poseidon. She bore two sons, but short of life were they, godlike Otus, and far-famed Ephialtes—men whom the earth, the giver of grain, reared as the tallest, and far the comeliest, after the famous Orion. For at nine years they were nine cubits in breadth and in height nine fathoms. Yea, and they threatened to raise the din of furious war against the immortals in Olympus. They were fain to pile Ossa on Olympus, and Pelion, with its waving forests, on Ossa, that so heaven might be scaled. And this they would have accomplished, if they had reached the measure of manhood; but the son of Zeus, whom fair-haired Leto bore, slew them both before