In ancient Greece, the people worshiped many Greek Gods and Goddesses.
The ancient Greek Gods include the 12 Olympian Gods and the Titan Gods.
The Olympians are the principal Gods and resides on Mount Olympus of Greek mythology.
The Greek Titans are the ancient Greek Gods, or the ancestors of the Olympians.
There are twelve Olympian Gods and Goddesses and numerous other Greek Gods and Goddesses.