According to the myth, Cronus overthrew his father, Uranus, by castrating him with a sickle. He then presided over what is known as the Golden Age. He and his wife,...
A theme that connects the myth of Cronus and Rick Riordan's The Lighting Thief is familial conflict and tension.
According to the myth, Cronus overthrew his father, Uranus, by castrating him with a sickle. He then presided over what is known as the Golden Age. He and his wife, Rhea, birthed the gods Hera, Zeus, Poseidon, and Hades. Although Cronus enjoyed his reign, he was troubled by the prophecy that he would one day be deposed by one of his own sons.
So, Cronus took steps to protect himself: he swallowed all of his children after their birth. For her part, Rhea managed to save Zeus by hiding him in a cave on the island of Crete. When he grew up, Zeus forced an emetic down Cronus's throat, which caused him to vomit out Zeus's siblings.
Zeus and his siblings then waged war upon Cronus. In this war, called the Titanomachy or the War of the Titans, the Olympians (led by Zeus) defeated the Titans (led by Cronus).
The theme of familial conflict and tensions is clear in the myth of Cronus. This major theme can also be seen in The Lightning Thief.
In the story, Poseidon, Zeus, and Hades are locked in a deadly battle of wills. Accordingly, Zeus has lost his thunder bolt, his primary weapon of power. He blames Poseidon (Percy's father) for his loss. Of course, Poseidon denies his guilt. His professions of innocence do not placate Zeus, however, who threatens to unleash war on Mount Olympus.
For his part, Percy (on behalf of his father, Poseidon) travels to the Underworld to confront Hades, who is believed to be behind the loss of Zeus's thunder bolt. However, Percy receives an unpleasant surprise there: not only does Hades not have Zeus's thunder bolt in his possession, he is himself missing his helm of darkness (his primary weapon of power).
Angered at Percy's presence, Hades accuses the boy of doing Poseidon's bidding by stealing both the thunder bolt and his own helm of darkness. In reality, the god of war, Ares, has the thunder bolt and helm of darkness. The text tells us that Percy battles Ares and manages to retrieve both weapons.
Ares then confesses that he is on Cronus's side and his main goal was to instigate a war between Poseidon, Hades, and Zeus (the sons of Cronus).
As the story ends, we learn that Cronus is preparing to wage war on his sons and the Olympians once more. So, the myth of Cronus is tied to The Lightning Thief through the theme of familial conflict and tension.