Diotima of Mantinea (; ; ) is a female philosopher and priestess who plays an important role in Plato's Symposium. Her ideas are the origin of the concept of Platonic love. Since the only source concerning her is Plato, it is uncertain whether she was a real historical personage or merely a fictional creation; however, nearly all of the characters named in Plato's dialogues have been found to correspond to real people living in ancient Athens.