The Defence of Poesy is a critical essay written by Sir Philip Sidney in the late 16th century, arguing for the value and purpose of poetry in society. It serves as a powerful argument in favor of poetry's ability to teach, delight, and inspire moral virtues, countering the negative perceptions held by some contemporary critics who viewed poetry as frivolous or deceptive. This work highlights the role of the poet as an important figure in the English Renaissance, emphasizing the transformative power of literature.