the complex interplay of sceptical, idealist, and materialist ideas in his work. Among his best-known poetic works are the long poems Alastor, or The Spirit of Solitude (1816), Julian and Maddalo (1818-19), The Mask of Anarchy (1819), Adonais (1821) and The Triumph of Life (1822); the short poems "Ozymandias"