Many versions of this myth have survived from ancient sources. The classic version is by Ovid, found in book 3 of his Metamorphoses (completed 8 AD). This is the story of Narcissus and Echo. There was a day when Narcissus was walking in the woods. Echo, an Oread (mountain nymph) saw him, fell deeply in love, and followed him. Narcissus sensed he was being followed and shouted "Who's there?". Echo repeated "Who's there?". She eventually revealed her identity and attempted to embrace him. He stepped away and told her to leave him alone. She was heartbroken and spent the rest of her life in lonely glens until nothing but an echo sound remained of her. Nemesis, the goddess of revenge, learned of this story and decided to punish Narcissus. She lured him to a pool where he saw his own reflection. He didn't realize it was only an image and fell in love with it. He eventually realised that his love could not be addressed and died.
An earlier version ascribed to the poet Parthenius of Nicaea, composed around 50 BC, was recently rediscovered among the Oxyrhynchus papyri at Oxford. Unlike Ovid's version, it end with Narcissus committing suicide. A version by Conon, a contemporary of Ovid, also ends in suicide (Narrations, 24). In it, a young man named Aminias fell in love with Narcissus, who had already spurned his male suitors. Narcissus also spurned him and gave him a sword. Aminias committed suicide at Narcissus's doorstep. He had prayed to the gods to give Narcissus a lesson for all the pain he provoked. Narcissus walked by a pool of water and decided to drink some. He saw his reflection and became entranced by it. He killed himself because he could not have his object of desire. A century later the travel writer Pausanias recorded a novel variant of the story, in which Narcissus falls in love with his twin sister rather than himself.