It is usually said to have begun with the French Symbolist movement and it artificially ends with the Second World War, the beginning and ending of the modernist period are of course arbitrary. Poets like W. B. Yeats (1865–1939) and Rainer Maria Rilke (1875–1926) started in a post-Romantic, Symbolist vein and modernised their poetic idiom after being affected by political and literary developments. Imagism proved radical and important, marking a new point of departure for poetry. Some consider that it began in the works of Hardy and Pound, Eliot and Yeats, Williams and Stevens. English-language poets, like T. S. Eliot, Ezra Pound, Robert Frost, Basil Bunting ('a born modernist'), Wallace Stevens, and E. E. Cummings also went on to produce work after World War II.