The first cyclopes were raised by Ouranus and Gaea. Ouranus was not pleased with the monsters and imprisoned them until Kronos overthrew him. During Kronos' rule, he did not release the cyclopes, so his mother Gaea, his son Zeus, and his wife Rhea plotted against him.
In most cases, Cyclopes are abandoned by their parents when they are born in order to learn how to fight for themselves. They mostly live in cities and are treated as outcasts or mistakes and they don't always come out right. No one wants them and they end up growing wild on the streets.
Cyclopes are also feared or avoided by most monsters , as even when they are young, they are still incredibly strong. Tyson, who is described as being a baby cyclopes, unknowingly frightened away other monsters, leading to Percy not being attacked all year. After the Laistrygonian Giant attacked Percy in the presence of Tyson, Annabeth commented that it was surprising they would even try to attack with Tyson around. Tyson was also able to beat most of the fully grown giants by himself without being injured.
Hyperborean (Northern) Cyclopes
A species of Cyclopes that often interact with Roman demigods. They fought for the Titans in the Second Titan War by building weapons and equipment. They often eat heroes and demigods. Typically smarter than Southern Cyclopes, The Northern Cyclopes use their building talents to make weapons like the squeaky war hammer and the exploding ax.
Weaponsmiths of the Gods, the three eldest Cyclopes, and the sons of Gaea and Ouranos. They were the primeval gods of storms, like their brothers the Hekatonkheires, particularly of thunderstorms (lightning). They typically help Hephaestus in the forges. They are assisted by the children of Poseidon. These Cyclopes created Zeus' Master Bolt, Poseidon's Trident, Hades' Helm of Darkness, Artemis' bow and arrows of moonlight, and Apollo's bow and arrows of sunlight.
Many Cyclopes of Cyclops population are children of Poseidon, but some are children of other Cyclopes, like Ma Gasket is the mother of Sump and Torque. Some help in the forges, some live in isolation, like ma Gasket and Polyphemus. The Southern Cyclopes are mostly children of Poseidon and the northern ones bred by Cyclopes.
Sheep Herders in the The Sea of Monsters. They also often eat heroes and demigods. The Southern Cyclopes often interact with Greek demigods and are typically malevolent. They seem to be not as smart as Northern Cyclopes since they don't use their building talents and instead herd sheep. It is also noted that in the Sea of Monsters, Polyphemus is not as smart as Ma Gasket in The Lost Hero, as Polyphemus doesn't know what a mango is and is repeatedly tricked by Grover. He is also shown he is bad at maths.