Who was the Roman goddess of the dawn?

The Roman goddess of the dawn was Aurora.

Aurora personified the first light of day and was imagined renewing herself each morning before flying across the sky to announce the Sun’s arrival. Her Greek counterpart was Eos, and her name preserves a much older Indo-European tradition of a divine dawn figure. In Roman poetry, dawn often marks the beginning of journeys, battles, love affairs, and new episodes in a story.

Aurora’s family relationships varied among ancient authors. She was commonly presented as the sister of Sol, the Sun, and Luna, the Moon. Ovid connected her with the mortal prince Tithonus, for whom she requested immortality from Jupiter. Because she failed to request eternal youth, Tithonus continued aging forever; in one later version, Aurora transformed him into a cicada.

Aurora should not be confused with Luna, who represented the Moon, or with Sol, who represented the Sun. The modern term aurora, including aurora borealis, ultimately derives from her Latin name.