Lewis & Short

Alcestis, is, or Alcestē, ēs, f., = Ἄλκηστις or Ἀλκήστη, daughter of Pelias, and wife of Admetus, king of Pherœ, for the preservation of whose life she resigned her own, but was afterwards brought back from the lower world by Hercules, and restored to her husband, v. Hyg. Fab. 51 and 251; Mart. 4, 75; Juv. 6, 652.
Also, a play of Nœvius, Gell. 19, 7.