Mythology & Beliefs: Eurydice In Greek and Roman Mythology, Eurydice was a nymph; wife of Orpheus.
Eurydice in Greek and Roman Biography and Mythology
（Εὐρυδίκη). The most celebrated of the many mythical
personages bearing this name is Eurydice, the wife of Orpheus.
[ORPHEUS.] There are seven others beside, viz. one of the
Danaides (Apollod. 2.1.5), a daughter of Adrastus and mother
of Laomedon (Apollod. 3.12.3), a daughter of Lacedaemon and
wife of Acrisius (Apollod. 2.2.2, 3.10.3; Paus. 3.13.6), a
daughter of Clymenus and wife of Nestor (Hom. Od. 3.452), the
wife of Lycurgus and mother of Archemorus (Apollod. 1.9.14),
the wife of Creon, king of Thebes (Soph. Antigone), and,
according to the "Cypria," the wife of Aeneias. (Paus.
10.26.1.) - A Dictionary of Greek and Roman biography and
mythology, William Smith, Ed.
Eurydice in Wikipedia
Eurydice (Εὐρυδίκη, EurydÝkē) (yur-ID-ih-see) in Greek
mythology, was an oak nymph or one of the daughters of Apollo
(the god of light). She was the wife of Orpheus, who loved her
dearly; on their wedding day, he played joyful songs as his
bride danced through the meadow. One day, a satyr saw and
pursued Eurydice, who stepped on a venomous snake, dying
instantly. Distraught, Orpheus played and sang so mournfully
that all the nymphs and gods wept and told him to travel to
the Underworld and retrieve her, which he gladly did. After
his music softened the hearts of Hades and Persephone, his
singing so sweet that even the Erinyes wept, he was allowed to
take her back to the world of the living. In another version,
Orpheus played his lyre to put Cerberus, the guardian of
Hades, to sleep, after which Eurydice was allowed to return
with Orpheus to the world of the living. Either way, the
condition was attached that he must walk in front of her and
not look back until both had reached the upper world. However,
just as they reached the portals of Hades and daylight, he
could not help but turn around to gaze on her face, and
Eurydice vanished again from his sight, this time forever...