Definition: Eleusinian worship, also known as Eleusine worship or Eleusinian mysteries, is a religious cult that originated in ancient Athens. It was a popular religion practiced throughout the city of Athens during the 5th century BC. The main belief of the Eleusinians was that they were descended from the gods of the underworld and believed that their ancestors had been given special powers by these gods to protect them and their community. The Eleusinian mysteries are associated with a