ERYX

In Apollodorus. ii he is called a son of Poseidon though others call him a son of Aphrodite and Butes of Sicily.

From Apollodorus. ii: "Now Eryx was a son of Poseidon, and he mingled the bull with his own herds. So Hercules entrusted the kine to Hephaestus and hurried away in search of the bull.

He found it in the herds of Eryx, and when the king refused to surrender it unless Hercules should beat him in a wrestling bout, Hercules beat him thrice, killed him in the wrestling, and taking the bull drove it with the rest of the herd to the Ionian Sea. But when he came to the creeks of the sea, Hera afflicted the cows with a gadfly, and they dispersed among the skirts of the mountains of Thrace."

In The Aeneid by Virgil Book V Acestes reproaches Entellus thus:

So tamely can you bear the ravish'd crown,
A prize in triumph borne before your sight,
And shun, for fear, the danger of the fight?
Where is our Eryx now, the boasted name,
The god who taught your thund'ring arm the game?
Where now your baffled honor? Where the spoil
That fill'd your house, and fame that fill'd our isle?"

In Metamorphoses by Ovid: The Story of Perseus, Perseus turns Eryx to stone with the head of Medusa:
This Eryx saw, but seeing wou'd not own;
The mischief by your selves, he cries, is done,
'Tis your cold courage turns your hearts to stone.
Come, follow me; fall on the stripling boy,
Kill him, and you his magick arms destroy.
Then rushing on, his arm to strike he rear'd,
And marbled o'er his varied frame appear'd.