In Greek mythology, Lethe was one of the five rivers of the underworld of Hades. Also known as the Ameles potamos, the Lethe flowed around the cave of Hypnos and through the Underworld where all those who drank from it experienced complete forgetfulness. Lethe was also the name of the Greek spirit of forgetfulness and oblivion, with whom the river was often identified. In Classical Greek, the word literally means "oblivion", "forgetfulness", or "concealment". It is related to the Greek word for "truth", aletheia, which through the privative alpha literally means "un-forgetfulness" or "un-concealment".
Mythology
River
Lethe, the river of forgetfulness, is one of the five rivers of the Greek underworld; the other four are Acheron, Cocytus, Phlegethon and Styx. According to Statius, it bordered Elysium, the final resting place of the virtuous. Ovid wrote that the river flowed through the cave of Hypnos, god of sleep, where its murmuring would induce drowsiness. The shades of the dead were required to drink the waters of the Lethe in order to forget their earthly life. In the Aeneid, Virgil writes that it is only when the dead have had their memories erased by the Lethe that they may be reincarnated.
Some ancient Greeks believed that souls were made to drink from the river before being reincarnated, so they would not remember their past lives. The Myth of Er in Book X of Plato's Republic tells of the dead arriving at a barren waste called the "plain of Lethe", through which the river Ameles runs. "Of this they were all obliged to drink a certain quantity," Plato wrote, "and those who were not saved by wisdom drank more than was necessary; and each one as he drank forgot all things." A few mystery religions taught the existence of another river, the Mnemosyne; those who drank from the Mnemosyne would remember everything and attain omniscience. Initiates were taught that they would receive a choice of rivers to drink from after death, and to drink from Mnemosyne instead of Lethe. These two rivers are attested in several verse inscriptions on gold plates dating to the 4th century BC and onward, found at Thurii in Southern Italy and elsewhere throughout the Greek world. There were rivers of Lethe and Mnemosyne at the oracular shrine of Trophonius in Boeotia, from which worshippers would drink before making oracular consultations with the god. More recently, Martin Heidegger used "lēthē" to symbolize the "concealment of Being" or "forgetting of Being" that he saw as a major problem of modern philosophy. Examples are found in his books on Nietzsche and on Parmenides.
Real rivers
Amongst authors in Antiquity, the tiny Lima river between Norte Region, Portugal, and Galicia, Spain, was said to have the same properties of memory loss as the legendary Lethe River, being mistaken for it. In 138 BCE, the Roman generalDecimus Junius Brutus Callaicus sought to dispose of the myth, as it impeded his military campaigns in the area. He was said to have crossed the Lima and then called his soldiers from the other side, one by one, by name. The soldiers, astonished that their general remembered their names, crossed the river as well without fear. This act proved that the Lima was not as dangerous as the local myths described. In Cádiz, Spain, the river Guadalete was originally named "Lethe" by local Greek and Phoenician colonists who, about to go to war, solved instead their differences by diplomacy and named the river Lethe to forever forget their former differences. When the Arabs conquered the region much later, their name for the river became Guadalete. In Alaska, a river which runs through the Valley of Ten Thousand Smokes is called the River Lethe. It is located within the Katmai National Park and Preserve in southwest Alaska.
