Aïdes, Aïdoneus, or Hades, was the son of Cronus and Rhea, and the youngest brother of Zeus and Poseidon. He was the ruler of that subterranean region called Erebus, which was inhabited by the shades or spirits of the dead, and also by those dethroned and exiled deities who had been vanquished by Zeus and his allies. Aïdes, the grim and gloomy monarch of this lower world, was the successor of Erebus, that ancient primeval divinity after whom these realms were called.
The early Greeks regarded Aïdes in the light of their greatest foe, and Homer tells us that he was "of all the gods the most detested," being in their eyes the grim robber who stole from them their nearest and dearest, and eventually deprived each of them of their share in terrestrial existence. His name was so feared that it was never mentioned by mortals, who, when they invoked him, struck the earth with their hands, and in sacrificing to him turned away their faces.
The belief of the people with regard to a future state was, in the Homeric age, a sad and cheerless one. It was supposed that when a mortal ceased to exist, his spirit tenanted the shadowy outline of the human form it had quitted. These shadows, or shades as they were called, were driven by Aïdes into his dominions, where they passed their time, some in brooding over the vicissitudes of fortune which they had experienced on earth, others in regretting the lost pleasures they had enjoyed in life, but all in a condition of semi-consciousness, from which the intellect could only be roused to full activity by drinking of the blood of the sacrifices offered to their shades by living friends, which, for a time, endowed them with their former mental vigour. The only beings supposed to enjoy any happiness in a future state were the heroes, whose acts of daring and deeds of prowess had, during their life, reflected honour on the land of their birth; and even these, according to Homer, pined after their career of earthly activity. He tells us that when Odysseus visited the lower world at the command of Circe, and held communion with the shades of the heroes of the Trojan war, Achilles assured him that he would rather be the poorest day-labourer on earth than reign supreme over the realm of shades.
The early Greek poets offer but scanty allusions to Erebus. Homer appears purposely to envelop these realms in vagueness and mystery, in order, probably, to heighten the sensation of awe inseparably connected with the lower world. In the Odyssey he describes the entrance to Erebus as being beyond the furthermost edge of Oceanus, in the far west, where dwelt the Cimmerians, enveloped in eternal mists and darkness.
In later times, however, in consequence of extended intercourse with foreign nations, new ideas became gradually introduced, and we find Egyptian theories with regard to a future state taking root in Greece, which become eventually the religious belief of the whole nation. It is now that the poets and philosophers, and more especially the teachers of the Eleusinian Mysteries, begin to inculcate the doctrine of the future reward and punishment of good and bad deeds. Aïdes, who had hitherto been regarded as the dread enemy of mankind, who delights in his grim office, and keeps the shades imprisoned in his dominions after withdrawing them from the joys of existence, now receives them with hospitality and friendship, and Hermes replaces him as conductor of shades to Hades. Under this new aspect Aïdes usurps the functions of a totally different divinity called Plutus (the god of riches), and is henceforth regarded as the giver of wealth to mankind, in the shape of those precious metals which lie concealed in the bowels of the earth.
The later poets mention various entrances to Erebus, which were for the most part caves and fissures. There was one in the mountain of Taenarum, another in Thesprotia, and a third, the most celebrated of all, in Italy, near the pestiferous Lake Avernus, over which it is said no bird could fly, so noxious were its exhalations.
In the dominions of Aïdes there were four great rivers, three of which had to be crossed by all the shades. These three were Acheron (sorrow), Cocytus (lamentation), and Styx (intense darkness), the sacred stream which flowed nine times round these realms.
The shades were ferried over the Styx by the grim, unshaven old boatman Charon, who, however, only took those whose bodies had received funereal rites on earth, and who had brought with them his indispensable toll, which was a small coin or obolus, usually placed under the tongue of a dead person for this purpose. If these conditions had not been fulfilled, the unhappy shades were left behind to wander up and down the banks for a hundred years as restless spirits.
On the opposite bank of the Styx was the tribunal of Minos, the supreme judge, before whom all shades had to appear, and who, after hearing full confession of their actions whilst on earth, pronounced the sentence of happiness or misery to which their deeds had entitled them. This tribunal was guarded by the terrible triple-headed dog Cerberus, who, with his three necks bristling with snakes, lay at full length on the ground; - a formidable sentinel, who permitted all shades to enter, but none to return.
The happy spirits, destined to enjoy the delights of Elysium, passed out on the right, and proceeded to the golden palace where Aïdes and Persephone held their royal court, from whom they received a kindly greeting, ere they set out for the Elysian Fields which lay beyond. This blissful region was replete with all that could charm the senses or please the imagination; the air was balmy and fragrant, rippling brooks flowed peacefully through the smiling meadows, which glowed with the varied hues of a thousand flowers, whilst the groves resounded with the joyous songs of birds. The occupations and amusements of the happy shades were of the same nature as those which they had delighted in whilst on earth. Here the warrior found his horses, chariots, and arms, the musician his lyre, and the hunter his quiver and bow.
In a secluded vale of Elysium there flowed a gentle, silent stream, called Lethe (oblivion), whose waters had the effect of dispelling care, and producing utter forgetfulness of former events. According to the Pythagorean doctrine of the transmigration of souls, it was supposed that after the shades had inhabited Elysium for a thousand years they were destined to animate other bodies on earth, and before leaving Elysium they drank of the river Lethe, in order that they might enter upon their new career without any remembrance of the past.
The guilty souls, after leaving the presence of Minos, were conducted to the great judgment-hall of Hades, whose massive walls of solid adamant were surrounded by the river Phlegethon, the waves of which rolled flames of fire, and lit up, with their lurid glare, these awful realms. In the interior sat the dread judge Rhadamanthus, who declared to each comer the precise torments which awaited him in Tartarus. The wretched sinners were then seized by the Furies, who scourged them with their whips, and dragged them along to the great gate, which closed the opening to Tartarus, into whose awful depths they were hurled, to suffer endless torture.
Tartarus was a vast and gloomy expanse, as far below Hades as the earth is distant from the skies. There the Titans, fallen from their high estate, dragged out a dreary and monotonous existence; there also were Otus and Ephialtes, those giant sons of Poseidon, who, with impious hands, had attempted to scale Olympus and dethrone its mighty ruler. Principal among the sufferers in this abode of gloom were Tityus, Tantalus, Sisyphus, Ixion, and the Danaïdes.