When Tereus desired his wife's sister, Philomela, he came to Athens to his father-in-law Pandion to ask for his other daughter in marriage, stating that Procne had died.
When Procne recognized her sister and knew the impious deed of Tereus, the two planned to return the favour to the king.
Procne, however, killed her son Itys by Tereus, served his flesh in a meal at his father's table in revenge, and fled with her sister.
[3] Shakespeare refers to Tereus in Titus Andronicus, after Chiron and Demetrius have raped Lavinia and cut out her tongue and also both her hands.
He also makes reference to Tereus in Cymbeline, when Iachimo spies upon the sleeping Imogen to gather false evidence so he can persuade Posthumus he has seduced her.