In Greek mythology, Charon (Greek Χάρων, fierce brightness) was the ferryman of Hades. He took the newly dead from one side of the river Acheron to the other if they had an obolus (coin) to pay for the ride. Corpses in ancient Greece were always buried with a coin underneath their tongue to pay Charon. Those who could not pay had to wander the banks of the Acheron for one hundred years.
According to Virgil's Aeneid (book 6), the Cumaean Sibyl directs Aeneas to the golden bough necessary to cross the river while still alive and return to the world. Orpheus also made the trip to the underworld and returned back alive.
He was depicted as a cranky, skinny old man or a winged demon with a double hammer.
It is often said that he ferried souls across the river Styx. This is suggested by Virgil in his Aeneid (book 6, line 369). However, by most accounts, including Pausanias (x.28) and, later, Dante's Inferno, the river was Acheron.