The term 'Sphinx Riddle Solver' refers to the legendary figure of Oedipus, who famously solved the riddle of the Sphinx. Oedipus was a mythical Greek king of Thebes who was known for his intelligence and bravery. He was able to answer the riddle posed by the Sphinx, which was a creature with the body of a lion and the head of a woman. By answering the riddle correctly, Oedipus saved the city of Thebes from destruction.