Beyond Sisyphus lies Tityus, a giant whose huge body covers nine acres of ground. He was condemned to the blackness of Tartarus because he dared to affront a goddess with his addresses, and so was doomed to suffer, like Prometheus, by being chained to a rock, while a vulture tears at his liver. Near him is Ixion, who was promised the hand of a certain maiden in marriage, on condition that he would give her father a large sum of money. Ixion agreed, but when the maiden became his wife, he refused to give the stipulated sum, in spite of her father's clamorous demands. At length, wearied by the old man's insistence, Ixion slew him; but the deed did not go unpunished, for the gods summoned him to appear before them and answer for his cruelty. Ixion pleaded his cause so well that Jupiter was about to dismiss him, when he saw the presumptuous mortal making love to Juno. This offense could not be overlooked, so Ixion was sent to Tartarus, where he was bound to an ever-revolving wheel of fire. If any one could follow the course of the gentle Lethe River, it would lead beyond the sunless realm of Pluto to a quiet and far-distant valley, where, in a soundless cave, live Somnus, the god of sleep, and his twin brother Mors, god of death. "Here the sun, whether rising or in his mid course, or setting, can never come; and fogs, mingled with the dimness, form a strange twilight. No wakeful bird calls forth the morn, nor do watchful dogs disturb the brooding silence. No sound of wild beast or cattle, nor any noise of creaking bough, nor human voice, breaks in upon the perfect stillness, where mute Rest has her abode. Before the cave bloom abundant poppies and other sleep-producing herbs, which Night gathers, that she may distil their juice and scatter slumbers on the darkened earth. Within the cave is no door that could creak on rusty hinges, and no porter stands at the entrance of that inner room where, on a downy couch made of black ebony and draped with sable curtains, over which black plumes wave, lies Somnus, the god of sleep,--Sleep, the repose of all things, gentlest of the deities from whom all care flies, the peace of mind who can sooth the hearts of men wearied with the toils of the day, and can refit them for labor."[43]