The monster typically depicted as having snakes for hair in Greek lore is Medusa. She is one of the Gorgons, known for her terrifying appearance and ability to turn onlookers into stone. Medusa's story has evolved, and she embodies themes of transformation and isolation. Once a beautiful maiden, her punishment by Athena led to her monstrous form, highlighting issues of vengeance and the consequences of actions. Her myth serves as a cautionary tale about power, beauty, and the challenges that arise from divine caprice in Greek mythology.