The poets, led by the analogy of the lovely appearance of the western sky at sunset, viewed the west as a region of brightness and glory. Hence they placed in it the Isles of the Blest, the ruddy Isle Erythea, on which the bright oxen of Geryon were pastured, and the Isle of the Hesperides. The apples are supposed by some to be the oranges of Spain, of which the Greeks had heard some obscure accounts. A celebrated exploit of Hercules was his victory over Antæus. Antæus, the son of Terra, the Earth, was a mighty giant and wrestler, whose strength was invincible so long as he remained in contact with his mother Earth. He compelled all strangers who came to his country to wrestle with him, on condition that if conquered (as they all were) they should be put to death. Hercules encountered him, and finding that it was of no avail to throw him, for he always rose with renewed strength from every fall, he lifted him up from the earth and strangled him in the air. Cacus was a huge giant, who inhabited a cave on Mount Aventine, and plundered the surrounding country. When Hercules was driving home the oxen of Geryon, Cacus stole part of the cattle, while the hero slept. That their footprints might not serve to show where they had been driven, he dragged them backward by their tails to his cave; so their tracks all seemed to show that they had gone in the opposite direction. Hercules was deceived by this stratagem, and would have failed to find his oxen, if it had not happened that in driving the remainder of the herd past the cave where the stolen ones were concealed, those within began to low, and were thus discovered. Cacus was slain by Hercules. The last exploit we shall record was bringing Cerberus from the lower world. Hercules descended into Hades, accompanied by Mercury and Minerva. He obtained permission from Pluto to carry Cerberus to the upper air, provided he could do it without the use of weapons; and in spite of the monster’s struggling, he seized him, held him fast, and carried him to Eurystheus, and afterwards brought him back again. When he was in Hades he obtained the liberty of Theseus, his admirer and imitator, who had been detained a prisoner there for an unsuccessful attempt to carry off Proserpine.