Though his life was short, Percy Bysshe Shelley was a prolific poet, authoring a list of works far too extensive to name in full in a brief note. Some of the more important of them include the Gothic novel Zastrozzi (1810); The Necessity of Atheism (1811), a treatise that caused him to be expelled from Oxford; a variety of political pamphlets; Queen Mab (1813); Alastor (1816); Adonais (1821); Julian and Maddalo (1824); The Masque of Anarchy (1832); and many sonnets, odes, and other shorter poems. Among his verse dramas, The Cenci (1819) and Prometheus Unbound (1820) stand out. His Defense of Poetry (1821) represents a major landmark in literary criticism. In 1816, after his first wife's suicide over his 1814 elopement, Shelley married Mary Wollstonecraft Godwin, who was to become the author of Frankenstein.