* Greek Mythology: The Titans were a race of primordial deities in Greek mythology, and they ruled the Earth, not the moon. The moon was associated with the goddess Selene.
* Roman Mythology: The Roman equivalent of Selene was Luna.
* Other Mythologies: Various other mythologies have deities associated with the moon, but none are typically referred to as Titans.
It's possible you're thinking of a different mythological figure or a concept from a specific fictional work. Could you provide more context about where you encountered this idea?