Cronus or Kronos, (Greek: Κρόνος), was a Titan. The Titans were the last children born of Gaia (Goddess of the Earth) and uranos (God of the sky).
According to the tale, Gaia was angry because Uranos had imprisoned some of their eldest children in Earth's own depths. For this reason, she asked her remaining children to destroy Uranus.
Cronos was the only one of her children brave enough to take action against him. He lay in wait for his father, and when he wounded him gravely (by chopping of his penis), Cronos then took hold of his genitalia and threw them as far as the eye could see, it then landed in the sea and traces of sperm and blood combined with the sea water to make sea foam, furies and , weirdly enough, the god of love Aphrodite. After the fight, Uranos cursed him in such a way that his children, being the Olympians, as they were later to be called, would kill him and overcome him, which was true and eventually happened after the ten year war.
After driving his father away, Kronos became king of the universe and the underworld , he did this by stealing the powers of the other Titans though he never controlled the earth AKA his mother Gaia, who cowered away in the depths of Tartarus. He remained so for eons, alongside his sister and queen, Rhea. Kronos prevented it by swallowing each of his children the day they were born. But when Rhea bore her sixth child, named Zeus, she had him secretly transported to Crete.
Rhea wrapped a stone in baby's clothes, and handed it to Kronos who promptly swallowed it. Later Kronos threw up the children that he ate and then there was a 10 year war against Cronus and the other Titans. The gods eventually won and overthrew the Titans. Zeus then cut up his father Cronus and threw him into the pit of Tartarus.
His Roman equivalent is Saturn.