Cycnus

And he slew Cycnus, the gallant son of Ares. For he found him in the close of far-shooting Apollo, him and his father Ares, never sated with war. Their armour shone like a flame of blazing fire as they two stood in their car: their swift horses struck the earth and pawed it with their hoofs, and the dust rose like smoke about them, pounded by the chariot wheels and the horses' hoofs, while the well-made chariot and its rails rattled around them as the horses plunged. And blameless Cycnus was glad, for he looked to slay the warlike son of Zeus and his charioteer with the sword, and to strip off their splendid armour. But Phoebus Apollo would not listen to his vaunts, for he himself had stirred up mighty Heracles against him. And all the grove and altar of Pagasaean Apollo flamed because of the dread god and because of his arms; for his eyes flashed as with fire. What mortal men would have dared to meet him face to face save Heracles and glorious Iolaus? For great was their strength and unconquerable were the arms which grew from their shoulders on their strong limbs.


- Hesiod, Shield of Heracles