Tereus
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In Greek mythology, Tereus was a son of Ares and husband of Procne. Procne and Tereus had a young son, Itys.
Tereus desired his wife's sister, Philomela. He forced himself upon her, then cut her tongue out and held her captive so she could never tell anyone. He told his wife that her sister had died. There was no writing in those days, but Philomela wove pictures in a tapestry depicting Tereus's crime and sent it secretly to Procne. In revenge, Procne killed her child Itys and served his flesh in a meal to his father Tereus. When Tereus learned what she had done, he tried to kill the sisters but all three were changed by the Olympian Gods into birds: Tereus became a hoopoe; Procne became the nightingale whose song is a song of mourning for the loss of her son; Philomela became the swallow. Because she has no tongue she can only twitter instead of singing.
The names "Procne" and "Philomela" are sometimes used in literature to refer to the nightingale, though only the former is mythologically correct.
