Eos is goddess of the dawn; she brings forth hope of the new day. She opens the gates of Heaven for the sun to rise, allowing her brother Helios (the sun god) to begin his daily journey across the sky. In the Homeric hymns, she is depicted as accompanying Helios.
She is also the mother of the Winds: Zephyrus, Boreas, and Notus. Her son is Eosphoros, the Morning Star.
She fell in love with the mortal Tithonus and begged Zeus to grant him immortality. In a cruel twist, immortal life was given but he continued to age. Eos had neglected to ask for eternal youth.
but when loathsome old age pressed full upon him, and he could not move nor lift his limbs, this seemed to her in her heart the best counsel: she laid him in a room and put to the shining doors. There he babbles endlessly, and no more has strength at all, such as once he had in his supple limbs. (Homeric Hymn to Aphrodite)
Eventually the gods took pity on him and turned him into a cicada. Eos’ grief is everlasting and her tears have become the source of our morning dew.