Margaret Gabrielle Vere Long (née Campbell; 1 November 1885 - 23 December 1952), who used the pseudonym Marjorie Bowen, was a British author who wrote historical romances, supernatural horror stories, popular history and biography. Her total output numbers over 150 volumes with the bulk of her work under the 'Bowen' pseudonym. She also wrote under the names Joseph Shearing, George R. Preedy, John Winch, Robert Paye. After The Viper of Milan (1906), she produced a steady stream of writings until the day of her death. Bowen's work under her own name was primarily historical novels.