The Greek adjective Gadarēnos (G1046) means "of Gadara" or "belonging to Gadara" — describing a person or thing from Gadara, a city of the Decapolis (ten-city league) on the eastern shore of the Sea of Galilee. Mark 5:1 identifies the region of the demoniac(s) as Gadarene.
The Gadarene demoniac story is one of the New Testament's most dramatic confrontations between Jesus and the demonic realm. Legion — a name meaning thousands — was cast out by a single command from Jesus, demonstrating His absolute authority over all spiritual powers. The subsequent reaction of the townspeople — begging Jesus to leave after their herd of pigs was destroyed — illustrates the tragic human tendency to prefer material loss over the liberating presence of Christ.