Selene

Selene (Ancient Greek: Σελήνη) was the Titaness of the Moon, or simply the moon as she was the moon personified into a divine being (the same goes for Helios and the sun). She has faded due to the laziness of the Romans, so the goddess Artemis took her place. Selene is the daughter of Hyperion and Theia, and the sister of Helios and Eos. She pulled the moon across the sky riding side saddle on a horse or in a chariot drawn by a pair of winged steeds. Her lunar sphere or crescent was represented as either a crown set upon her head or as the fold of a raised, shining cloak. Sometimes she was said to drive a team of oxen and her lunar crescent was likened to the horns of a bull. Selene's great love was the shepherd prince Endymion. The beautiful boy was granted eternal youth and immortality and placed in a state of eternal slumber in a cave near the peak of Lydian Mount Latmos.

Love Life
Selene was different from Artemis, who replaced her, as Selene did have a few lovers, both mortal and divine alike while Artemis shunned the company of men. One day while pulling the moon across the sky, she spotted the shepherd/prince Endymion, and fell in love. She put him into eternal sleep so he may never grow old or die, and together they had fifty daughters (and according to some also a son, Narcissus). The daughters ruled over each month that separates the Olympic games, since they happen every fifty months. She bore Zeus three daughters, Pandeia (the shining full moon), Ersa (the all-nourishing dew) and Nemeia. Some stories also state she was the mother of the Nemian Lion with Zeus. She also had an encounter with the great nature god Pan, who deceived her by wrapping himself in sheepskin and offered her a ride on his back. While they were airborne, he attacked her.

The Titan's Curse
Helios was the first sun god, and Selene was the first moon goddess. But it was said by Apollo, due to the laziness of the Romans, they were forced to give up their roles as the sun and moon gods, and pass them on to him and his sister Artemis. They faded, and Artemis and Apollo took their roles as the Sun and Moon.

Powers
She presumably had the same powers that Artemis has over the moon, but more advanced due to her being the very first lunar deity on top of being the moon incarnate (unlike Artemis who is just another moon(light) goddess). Selene may have had powers over childbirth and night. That last one outing itself in umbrakinesis which could be used to render herself invisible and bend shadows to her will. Selene also may have had hydro- and chronokinetic abilities due to her being the titaness of the moon (which influences the tides) and month respectively as well as the power to both induce and cure lunacy. Furthermore, like her brother Helios (and perhaps Eos), she problably was an impecable archer.

Trivia

 * Selene is also seen as a goddess of the night, radiance, childbirth and lunacy.
 * In the anime series, Sailor Moon, the goddess's story lies at the base of the storyline.
 * Selene and Helios were also seen as the parents of the Horae (godesses of the seasons).
 * According to some sources Selene and Endymion were the parents of the famed Narcissus, the very handsome youth who spurned the affections of those who were attracted to him. The youth Ameinias who became distraught when Narkissos cruelly spurned him, slew himself before his door, calling on the goddess Nemesis to avenge him. His prayer was quickly answered, when Narkissos fell in love with his own image reflected in a pool. Gazing endlessly at the reflection, he slowly pined away and was transformed by the nymphs into a narcissus flower.
 * She differs from Artemis, because Artemis is a virgin goddess (swears off men) while Selene had mortal and divine consorts alike.
 * The chemical element Selenium is named after her as the term Lunacy was named after her Roman incarnation Luna.