What is cronus afraid of?

Cronus, the Greek Titan, is primarily afraid of being overthrown by his own children, as he had learned from a prophecy that one of them would eventually defeat him. To prevent this, he swallowed each of his children at birth. His fear ultimately came true when his son Zeus led a rebellion against him, resulting in Cronus's defeat and the rise of the Olympian gods. This reflects the broader theme of the inevitability of fate in Greek mythology.