👉 Tartessus is a term in Greek mythology used to describe the concept of a malevolent, or evil, spirit that possessed the body of a human, often as an embodiment of darkness and corruption. The term was originally associated with the god Dionysus, who is often depicted as a malevolent figure, but it has been applied to various other gods and goddesses over time. Tartessus is sometimes also used in reference to the mythological entity known as the Black Hand, which