By the aid of his divine herdsman, Admetus accomplished this difficult task, and gained his bride. Nor was this the only favour which the king received from the exiled god, for Apollo obtained from the Fates the gift of immortality for his benefactor, on condition that when his last hour approached, some member of his own family should be willing to die in his stead. When the fatal hour arrived, and Admetus felt that he was at the point of death, he implored his aged parents to yield to him their few remaining days. But "life is sweet" even to old age, and they both refused to make the sacrifice demanded of them. Alcestis, however, who had secretly devoted herself to death for her husband, was seized with a mortal sickness, which kept pace with his rapid recovery. The devoted wife breathed her last in the arms of Admetus, and he had just consigned her to the tomb, when Heracles chanced to come to the palace. Admetus held the rites of hospitality so sacred, that he at first kept silence with regard to his great bereavement; but as soon as his friend heard what had occurred, he bravely descended into the tomb, and when death came to claim his prey, he exerted his marvellous strength, and held him in his arms, until he promised to restore the beautiful and heroic queen to the bosom of her family.
-page 77, Berens