Harold Harmsworth, 1st Viscount Rothermere

British newspaper proprietor (1868–1940)

Harold Sidney Harmsworth, 1st Viscount Rothermere (26 April 1868 – 26 November 1940), was a leading British newspaper proprietor who owned Associated Newspapers Ltd. He is best known, like his brother Alfred Harmsworth, later Viscount Northcliffe, for the development of the Daily Mail and the Daily Mirror. Rothermere was a pioneer of popular tabloid journalism, and his descendants continue to control the Daily Mail and General Trust.

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