Question: Who were the Roman and Greek goddesses of the Moon and the sea?
Answer: Diana was the Roman goddess of the Moon. She was a "multipurpose" goddess, presiding over the hunt and childbirth, among other things. In her incarnation as Moon goddess, she was known as Luna. Artemis was the Greek goddess of the Moon. Gods, not goddesses, ruled the sea -- Neptune in Roman mythology and Poseidon in Greek.