Horace, a prominent poet of the Roman Augustan age, wrote 'Ars Poetica' as an epistle advising the Pisco family on poetry, though he subtly discourages them from pursuing it. He emphasizes the importance of decorum and the proper roles of both poets and critics, advocating for a unified style across genres. Horace argues that poetry should please, teach, and remain true to classical forms while criticizing the mixing of genres and inappropriate content.