Dejah Thoris is a fictional character and princess of the Martian city-state/empire of Helium in Edgar Rice Burroughs' series of Martian novels. She is the daughter of Mors Kajak, Jed (chieftain) of Lesser Helium, and the granddaughter of Tardos Mors, Jeddak (overlord or high king) of Helium. She is the love interest and later the wife of John Carter, an Earthman mystically transported to Mars, and subsequently the mother of their son and daughter . She plays the role of the conventional damsel in distress who must be rescued from various perils, but is also portrayed as a competent and capable adventurer in her own right, fully capable of defending herself and surviving on her own in the wastelands of Mars.