After a millennia, The primordials were getting bored of the earth being so empty, so they found comfort in eachother. Most searched for other primordials with a similar domain to themselves, such as Nyx and Erebus. However not all were the same. The most prominent was Gaea and Ouranos. However, before that Gaea and Aether worked together to create humans and animals to populate the earth, while Potus created sea creatures and Ouranos and Hemera created birds and other flying creatures.
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When Gaea and Ouranos got together they first birthed the elder cyclops, and Ouranos was so disgusted with their looks threw them into the pit, otherwise known as Tartarus. The next children that Gaea gave birth to was the titans who were lead by the youngest and the Titan of time Kronos. Gaea was so upset with Ouranos for throwing her first born into the pit that she turned the titans against him and gave Kronos a scythe that was strong enough to kill a Primordial. With that Kronos convinced his siblings to help destroy their father and to force him into fading, and when Ouranos was on his final moments he uttered a curse that the same thing would happen to Kronos, that one day his children would turn on him as he did to his father.
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Kronos in his arrogance took his father's last words as a dead man's rambling. However, when Kronos found out his wife, Rhea, was pregnant with his children he remembered his father last words, and in his paranoia he ate his children whole, starting with Hestia, then Hades, next was Hera, after that was Poseidon, then Demeter, and after all of this Rhea was furious with her husband and hid her youngest child Zeus where later he then went back and fed his father a mixture of mustard and wine in order to make his puke up his siblings where they proceeded to wage war with their father and after he was defeated the gods took over ruling the world with Zeus as the king of gods. After many millennia have passed that leads us to the life of the demigod of Poseidon Perseus Jackson.