The warlord of Mars
By Edgar Rice Burroughs
Cover: Carta generale del pianeta Marte (1888), colour map by Giovanni Schiaparelli (1835-1910) · Wikimedia Commons · Public domain (artist died 1910)
The Warlord of Mars is a science fantasy novel by American writer Edgar Rice Burroughs, the third of his Barsoom series. Burroughs began writing it in June, 1913, going through five working titles; Yellow Men of Barsoom, The Fighting Prince of Mars, Across Savage Mars, The Prince of Helium, and The War Lord of Mars.
Summary source: Wikipedia: The Warlord of Mars · CC BY-SA 4.0