Princess Dejah Thoris is a fictional character from the Barsoom series, created by author Edgar Rice Burroughs. She is the daughter of the ruler of Helium, one of the city-states on the planet Mars. Dejah is known for her beauty, intelligence, and strong will, often playing a key role in the adventures of the series' protagonist, John Carter. In the stories, Dejah Thoris is frequently portrayed as a damsel in distress, but she also exhibits bravery and resourcefulness. Her character embodies the themes of love and loyalty, as she often finds herself in perilous situations that require both her courage and the assistance of John Carter to overcome.