Beginning in 1969, O’Brian began writing what turned into the 20-volume Aubrey–Maturin series of novels. The books are set in the early 19th century and describe the life and careers of Captain Jack Aubrey and his friend, naval physician Dr Stephen Maturin. The books are distinguished by O’Brian’s deliberate use and adaptation of actual historical events, either integrating his protagonists in the action without changing the outcome, or using adapted historical events as templates. In addition to this trait and to O’Brian’s distinctive literary style, his sense of humour is prominent (see Humour in main article, Aubrey-Maturin series). Technical sailing terminology is employed throughout the series. The books are considered by some critics to be a roman fleuve, which can be read as one long story; the books follow Aubrey and Maturin’s professional and domestic lives continuously.
