Lucilius, Satires, Book 15, frag. 480-3 (Marx)

multa homines portenta in Homeri versibus ficta
monstra putant, quorum in primis Polyphemus ducentos
Cyclops longus pedes: et porro huic maius bacillum
quam malus navi e corbita maximus ullast.

People think the many fictitious creatures created in Homer’s verses to be monsters; principal among these is Polyphemus the Cyclops, two hundred feet tall; and furthermore he had a staff  bigger than a massive ship’s mast from a slow-sailing vessel.