The Aubrey–Maturin series is a collection of historical novels written by author Patrick O'Brian. The series follows the adventures of Captain Jack Aubrey of the British Royal Navy and his close friend, Dr. Stephen Maturin, during the early 19th century, primarily during the Napoleonic Wars. Spanning 20 novels, the series is known for its detailed depiction of naval warfare, ship life, and the complexities of friendship. It combines elements of adventure, history, and character development, making it a beloved work among fans of maritime literature.