Who was the father of the six original Olympian gods?

The father of the six original Olympian gods—Zeus, Hera, Poseidon, Demeter, Hestia, and Hades—was Cronus. Cronus was the leader of the Titans and overthrew his father, Uranus, to take control of the cosmos. However, fearing a prophecy that he would be overthrown by one of his own children, Cronus swallowed each of them at birth, until Zeus ultimately rescued them.