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In page Itylus:

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Attic authors later than Homer, including the dramatists, knew a different nightingale myth in which Procne was married to Tereus, who raped her sister Philomela. Tereus cut out Philomela's tongue so that she could not tell. (In some versions[citation needed], Philomela is the name of the wife, Procne of her mutilated sister.) Philomela wove her story into a robe that she gave to Procne. In a fit of madness, Procne then murdered her own child by Tereus, Itys. All were changed to birds,[2] though the specific birds vary; for example, in Ovid, Philomela is changed to a nightingale. For more details, see Philomela.