"Pyramus and Thisbe" was a source for Romeo and Juliet. It also appears in A Midsummer Night's Dream. It was originally published by the Roman writer Ovid in his Metamorphoses.
This story stars two lovers whose families are feuding, like Romeo and Juliet. The two are forbidden to love each other, so they communicate through a chink in the wall separating their houses. They arrange to meet by a tomb and mulberry tree to declare their love, but, as at the end of Romeo and Juliet, a mix-up occurs. Thisbe arrives first but runs off after she sees a lion. She leaves her veil behind. When Pyramus arrives, he finds Thisbe's veil, which has been torn and bloodied by the lion. He thinks Thisbe is dead, so he stabs himself. When Thisbe returns and finds Pyramus dead, she too stabs herself.
Thus, both stories end with a double suicide based on a misunderstanding. In Romeo and Juliet,the confusion arises when Romeo fails to get a message saying that Juliet has taken a potion that makes her appear dead but is not really dead. When Romeo thinks he sees her dead body, he kills himself, and Juliet stabs herself to death when she finds the dead body of Romeo.