Echo in Greek and Roman Biography and Mythology
（Ἠχώ), an Oreade, who when Zeus was playing with the nymphs,
used to keep Hera at a distance by incessantly talking to her.
In this manner Hera was not able to detect her faithless
husband, and the nymphs had time to escape. Hera, however,
found out the deception, and she punished Echo by changing her
into an echo, that is, a being with no control over its
tongue, which is neither able to speak before anybody else has
spoken, nor to be silent when somebody else has spoken. Echo
in this state fell desperately in love with Narcissus, but as
her love was not returned, she pined away in grief, so that in
the end there remained of her nothing but her voice. (Ov. Met.
3.365-401.) There were in Greece certain porticoes, called the
Porticoes of Echo, on account of the echo which was heard
there; thus, there was one stoa at Hermione with a threefold,
and one at Olympia with a sevenfold echo. (Paus. 2.35.6,
5.21.7.) Compare Wiesler, Die Nymphe Echo : eine
kunstmythologische Abhandlung, Göttingen, 1844. - A Dictionary
of Greek and Roman biography and mythology, William Smith, Ed.
Echo in Wikipedia
In Greek mythology, Echo (Greek: Ἠχώ, Ēkhō; "Sound") was an
Oread (a mountain nymph) who loved her own voice. Zeus loved
consorting with beautiful nymphs and visited them on Earth
often. Eventually, Zeus's wife, Hera, became suspicious, and
came from Mt. Olympus in an attempt to catch Zeus with the
Zeus, the King of the Olympians, was known for his many love
affairs. Sometimes the young and beautiful nymph Echo would
distract and amuse his wife Hera with long and entertaining
stories, while Zeus took advantage of the moment to ravish the
other mountain nymphs. When Hera discovered the trickery she
punished the talkative Echo by taking away her voice, except
in foolish repetition of another's shouted words. Thus, all
Echo could do was repeat the voice of another....