How did Rhea save Poseidon?

Rhea saved Poseidon by hiding him from Cronus, who feared a prophecy that one of his children would overthrow him. When Poseidon was born, Rhea secretly took him to the island of Crete and entrusted him to the care of nymphs, ensuring he would grow up safely away from Cronus's reach. Later, when the time was right, Poseidon returned to challenge his father alongside his siblings, ultimately leading to Cronus's defeat. Rhea's actions were crucial in preserving Poseidon's life and allowing him to fulfill his destiny.