The literary device in the line "It is not possible: you have not a man in all Athens able to discharge Pyramus but he" is allusion-mythology.
This device implies referring to mythology or referring to the mythological stories of a specific culture or group.
Pyramus is a character in Greek mythology known for loving a girl known as Thisbe. According to the myth, this love would lead to the death of both lovers but will show the importance of being faithful.
In this way, by mentioning Pyramus the author is appealing to one specific myth, and therefore, there is an allusion-mythology literary device.
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