Pyramus and Thisbe are two characters of Roman mythology

Roman mythology

Roman mythology is the body of traditional stories pertaining to ancient Rome's legendary origins and religious system, as represented in the literature and visual arts of the Romans...

, whose love story of ill-fated lovers is also a sentimental romance.

The tale is told by Ovid

Ovid

Publius Ovidius Naso , known as Ovid in the English-speaking world, was a Roman poet who is best known as the author of the three major collections of erotic poetry: Heroides, Amores, and Ars Amatoria...

 in his Metamorphoses

Metamorphoses (poem)

Metamorphoses is a Latin narrative poem in fifteen books by the Roman poet Ovid describing the history of the world from its creation to the deification of Julius Caesar within a loose mythico-historical framework. Completed in AD 8, it is recognized as a masterpiece of Golden Age Latin literature...

.
In the Ovidian version, Pyramus and Thisbe is the story of two lovers in the city of Babylon

Babylon

Babylon was an Akkadian city-state of ancient Mesopotamia, the remains of which are found in present-day Al Hillah, Babil Province, Iraq, about 85 kilometers south of Baghdad...

 who occupy connected houses/walls, forbidden by their parents to be wed, because of their parents' rivalry. Through a crack in one of the walls, they whisper their love for each other.