Kaikasi was one of the daughters of Sumali and Ketumati, the Rakshasas. She was married to Muni Visravas and the mother of Ravana.
Sumali with his family lived for a long time in Patala, the Naraka. He once visited the earth and wanted his daughter Kaikasi to entice Visravas. Visravas was mesmerized by her beauty and married her. She gave birth to Ravana, the huge Kambhakarna who grew up in the forest.