Empusa was not a traditional vampire in the sense of a reanimated corpse, but she was a vampire spirit.
In Greek mythology, Empusa was a demigoddess often associated with Lamia and Mormo.
In later Greek mythology, her role was reduced to a species of Hecate, called empuse, or empusa. The empusae (plural of empusa) were sent by Hecate to guard roads and devour any travelers.
Empusa feasted on the blood of young men as they slept, but before drinking their blood, she would eat their flesh. She is often pictured wearing brazen slippers and with flaming hair.
Empusai and Mormolykiai are vampires that derived from the myths and stories of Empusa.