A Princess of Mars is a classic science fantasy novel by Edgar Rice Burroughs, first serialized in 1912 and published as a book in 1917, introducing the planet Barsoom (Mars) and its hero, John Carter, a Civil War veteran mysteriously transported there. The story follows Carter as he gains superhuman strength in Mars's low gravity, battles giant green Martians (Tharks), and rescues the beautiful Princess Dejah Thoris, becoming a hero in a world of swordplay, adventure, and romance. It's the first book in the influential "Barsoom" series, a seminal work in the planetary romance and pulp fiction genres.