It seemed as if Admetus were destined to enjoy a long and prosperous reign, but shortly after he brought his queen home he fell ill of a very deadly plague. Aesculapius, the physician, was no longer able to come to the king's aid and it seemed as if there was no hope for him. But his celestial herdsman, Apollo, again befriended him. Apollo was not able to entirely remove the plague but he decreed that the king should live if someone, who cared enough for him, would die in his stead.
Admetus was full of joy at this hope. He remembered the vows of faith and attachment that bound all his courtiers to him and he expected that a score would at once offer themselves, willing to sacrifice their lives for their king. But not one was to be found. The bravest warrior, who would willingly have given his life for his king on the battlefield, had not the courage to die for him on a sick-bed. Old servants, who had known the king's bounty and that of his father from the days of their childhood, were not willing to give up the rest of their few days for their sovereign. Each subject wished someone else to make the sacrifice.
"Why do not the parents of Admetus give their lives for their son?" was asked, but these aged people felt that they could not bear to be parted from him for even a short time, and looked to others.
What was to be done about it. It was an irrevocable decree on the part of Apollo that he had wrested only by means of much persuasion from the Fates. There was no remedy for Admetus except this sacrifice.
Then a very strange and wonderful thing happened. Queen Alcestis, the fair princess who had wanted to ride behind lions and bears when she was a girl in her own kingdom, had grown very wise and gracious since she had attained to the throne of Thessaly. It had never for an instant entered the minds of anyone that she could be offered to the gods in the place of the king. But Queen Alcestis offered herself to save Admetus, and as she sickened the king revived and was restored to his old health and vigor.
Apollo was, of all the mourners of Thessaly, the saddest to see Alcestis so ill. She had often found her way to the pastures where he led his flock and had sat on a bank twining wreaths of wild flowers that she liked better to wear than a crown, while he entertained her with the music of his lute. And, for once, Apollo did not know what to do, banished as he was from the council of the gods for a while, and unable to summon the physician, Aesculapius, to his aid.
He knew that only great strength could bring Alcestis back from the stupor in which she now lay, neither moving or speaking, and with her rosy cheeks pale and her eyes closed. He knew, too, that of all the heroes Hercules was the strongest. Hercules had performed feats that no one had believed possible. Would he attempt to keep Alcestis safe from death, Apollo wondered, particularly when he was entreated by a lowly herdsman?
Hercules assented, however. He took his station at the gates of the palace and wrestled with Death, throwing him, just as he was about to enter and claim Alcestis. She lost her weakness, opened her eyes, the color came again to her cheeks and she was restored to Admetus by this last labor of Hercules.