Just Cos

When Hercules was sailing from Troy, Hera sent grievous storms, which so vexed Zeus that he hung her from Olympus. Hercules sailed to Cos, and the Coans, thinking he was leading a piratical squadron, endeavored to prevent his approach by a shower of stones. But he forced his way in and took the city by night, and slew the king, Eurypylus, son of Poseidon by Astypalaea. And Hercules was wounded in the battle by Chalcedon; but Zeus snatched him away, so that he took no harm. And having laid waste Cos, he came through Athena's agency to Phlegra, and sided with the gods in their victorious war on the giants.


- Apollodorus, Library, Book 2, Chapter 7, Section 1