Cyclops

A Cyclops (in the books, the plural used is cyclopes) is a one-eyed monster. They are very big and sometimes considered ugly. Many cyclopes were born to Poseidon with nature spirits, therefore making them Percy's half-brothers. Tyson is now the general of the armies of Poseidon. They apparently have excellent hearing and can mimic any voice perfectly. This was done by Tyson to eavesdrop on various allies of Kronos, and by a unnamed cyclops in Brooklyn to trick and trap a younger Luke Castellan, Annabeth, and Thalia. Most cyclopes work in the forges of Hephaestus.

According to Greek mythology, the first Cyclopes were born to Uranus and Gaia. Uranus was not pleased with his newborn monster children and imprisoned them until Kronos overthrew him. During Kronos' rule, though, he did not release his cyclops brothers, so Gaia and his wife Rhea became furious at him.

Known Cyclopes

 * Tyson
 * Polyphemus