Patrick O'Brian, CBE, born Richard Patrick Russ, was an English novelist and translator, best known for his Aubrey–Maturin series of sea novels set in the Royal Navy during the Napoleonic Wars, and centred on the friendship of the English naval captain Jack Aubrey and the Irish–Catalan physician Stephen Maturin. The 20-novel series, the first of which is Master and Commander, is known for its well-researched and highly detailed portrayal of early 19th-century life, as well as its authentic and evocative language. A partially finished 21st novel in the series was published posthumously containing facing pages of handwriting and typescript.