The Titan who unseated his own father to rule the Golden Age — and then, in fear of the same fate, devoured his children, until the one who escaped, Zeus, brought his reign to an end.
Michael PaycerKing of the Titans; harvest, time
The sickle or scythe
Saturn — see the planet Saturn
Cronus (also spelled Kronos) is the leader of the Titans, the generation of gods who ruled before the Olympians. He is the youngest and boldest child of Uranus, the sky, and Gaia, the earth — and the central figure in the Greek story of how power passes, violently, from one generation to the next.
His reign was remembered as the Golden Age, a lost paradise when humans lived without toil, war, or old age. Yet the same myth makes him a monster of fear: warned that his own child would overthrow him, he swallowed them one by one. Cronus is the Greeks thinking about succession itself — the dread that the thing you create will replace you.
In Hesiod's Theogony, Uranus imprisoned his monstrous children inside Gaia, who in agony forged a great sickle and begged her sons to act. Only Cronus dared. He ambushed and castrated his father, ending Uranus's rule and taking the cosmos for himself — the first overthrow in Greek myth, and the model for every one that follows.
Cronus married his sister Rhea and fathered the first Olympians. But the same prophecy that doomed Uranus now haunted him: a child of his would depose him. So he swallowed each newborn — Hades, Poseidon, Hera, and the rest — whole. Rhea, desperate, hid her last child on Crete and handed Cronus a stone wrapped in swaddling clothes, which he swallowed in its place.
With Gaia's sickle, Cronus overthrew the sky itself. From the blood that fell to earth sprang the Furies and the Giants; from the sea foam where the severed flesh landed rose Aphrodite. Creation and violence are bound together at the very root of the Greek cosmos.
To keep his throne, Cronus consumed his own offspring at birth. The image — a god swallowing his children out of fear of the future — became one of the most haunting in all of art, most famously in Goya's black painting.
Grown in secret, Zeus forced Cronus to disgorge the swallowed children, then led them in a ten-year war against the Titans. Victorious, the Olympians cast the Titans into Tartarus, and a new order began — exactly the fate Cronus had tried to prevent.
The Romans identified Cronus with Saturn, god of agriculture and time, honored at the midwinter festival of Saturnalia — an ancestor of many of our winter-holiday customs, and the source of the planet's name and the day Saturday. Because his name resembled Chronos, "time," Cronus was blended with time itself; his scythe became the scythe of Father Time and the Grim Reaper, the harvester who cuts down all things.
In the night sky his name endures on the ringed planet Saturn and its giant moon Titan, named for his kin — the Titans he once led.
Cronus is time as devourer. The sickle that unmade his father and the harvest it evokes are the same blade that reaps every living thing; the children he swallows are the future that time consumes. He is also the archetype of the ruler undone by his own fear — the tyrant so afraid of being replaced that he destroys what he loves, and in doing so guarantees his fall.
A famous public-domain depiction — click to view it full size.

“She wrapped a great stone in swaddling clothes and gave it to the mighty son of Heaven... He took it in his hands and thrust it down into his belly.”
Hesiod, Theogony — the deceiving of Cronus
“Golden was that first age, which, with no one to compel, without a law, of its own will, kept faith and did the right.”
Ovid, Metamorphoses — on the Golden Age of Saturn's reign
Cronus stages the oldest fear of power: that whatever you create to secure the future is the very thing that ends you. Can any ruler ever escape being replaced — and is the attempt to escape it what dooms them?
The succession myth — Uranus overthrown by Cronus, Cronus by Zeus — is the Greeks' meditation on generational change. Each ruler tries to freeze time and hold power forever; each is undone by the future he tried to strangle. Cronus swallowing his children is that logic made literal: the present devouring the future to preserve itself, and failing.
It is no accident that Cronus blurred into Chronos, time itself. Time is the one power no throne can depose. The Golden Age he ruled is always spoken of as lost — because time, in the end, consumes even paradise.
The leader of the Titans, youngest child of Uranus and Gaia. He overthrew his father to rule the Golden Age, then was overthrown by his own son Zeus.
A prophecy said one of his children would overthrow him, as he had overthrown his father. To prevent it he swallowed each at birth — until Rhea hid Zeus and gave Cronus a stone instead.
No, but they were often merged. Cronus is the Titan king; Chronos is time personified. The similar names led writers to blend them, giving Cronus his link to time, harvest, and the scythe.
When I am not reading Homer or Nietzsche, I tune databases, design high-availability systems, and run cloud migrations.