He is often ranked as one of the five most important poets of the Romantic movement in English literature ; the other four are William Wordsworth , Samuel Taylor Coleridge , Lord Byron , and Percy Bysshe Shelley . Along with Lord Byron and Percy Bysshe Shelley , he was one of the key figures in the second generation of the Romantic movement , despite the fact that his work had been in publication for only four years before his death .