A book-length poem that caused great consternation when it first appeared in 1840, Sordello became a byword for poetic difficulty, both because of its unfamiliar subject-matter (as now, few people had a grasp of the arcana of Italian medieval politics), but also because of Browning's verse style. His language is here impacted, with the reader needing to be alert to follow the twists and turns of the narrative. Sordello is an important work, and crucial in Browning's development. It is also an astonishing work to come from the pen of a 28-year-old, and one can see why Ezra Pound treated it so seriously when he was about to embark upon The Cantos.