Remember last week Zeus was a pioneer of the Vore fetish? Well if he is a pioneer then his father was the founder. This tale provides enough trauma to make the Greek Gods the douchebags they are known for.
After Kronos defeated and castrated his father Uranus (a little much eh), Kronos married his sister (that's where Zeus got that from) and started having kids. However, Kronos learned from a prophecy that he too would be usurped by his offspring. Thus he came up with a brilliant idea, he would eat his children.
Yum tastes like fish (get it, because it is Poseidon)
So ever time his wife Rhea gave birth Kronos would eat them up and keep them imprisoned in his stomach. Now Rhea didn't like to see her children so she consulted her mother Gaea who gave her a rock which was baby shaped. When she had her last child, Zeus, she gave her cruel husband the rock which he ate unknowingly. Zeus would then be able to grow up and when he got old enough, confronted his father as a stranger and gave him a concoction that caused him to vomit the rock and the now adult Olympians (and Hades). With this the battle for heaven began and in the end the Titanomachy fell.
Now I leave you this image of the supposed reincarnation of Kronos