Solution:Sidney penned several major works of the Elizabethan era, including 'Astrophel and Stella', the first Elizabethan sonnet cycle and .Arcadia, a heroic prose romance. He was also known for his literary criticism, known as The Defense of Poesy. Sidney has described about 'Poetry' in his work 'An Apology for Poetry' and describes that poetry is of three kinds. They are : (a) Religious poetry (b) Philosophical Poetry (c) Poetry as an imaginative treatment of life and nature. He also describe poetry as an art of imitation, a representing, counterfeiting or figuring forth; to speak metaphorically, a speaking picture, with this end - to 'teach and delight'.