The change of Philomel, by the barbarous king
So rudely forced; yet there the nightingale
From Ovid’s Metamorphoses, Book VI. Philomela and Procne were sisters. Procne married King Tereus. Tereus raped (“rudely forced”) Philomela and cut out her tongue to silence her.
Philomela weaved her story into a tapestry to tell her sister about what happened. Procne fed their son to Tereus as punishment. The sisters fled, with Tereus in pursuit.
The gods intervened, changing Philomela into a nightingale, Procne into a swallow, and Tereus into a hawk (some versions of the myth vary this.)
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