This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Drakon (Greek)
The word dragon derives from the Greek (drakon) and its Latin cognate draco. Ancient Greeks applied the term to large, constricting snakes. The Greek drak?n was far more associated with poisonous spit or breath than the modern Western dragon, though fiery breath is still attested in a few myths. Drakons (not to be confused with Dragons) are giant, monster serpent-like creatures several millennia older than dragons.
One drakon mentioned in the myths was of Sosipolis, a son of Eileithyia, the Goddess of Childbirth. As he was protecting the city of Elis as a child from the Arcadians, he transformed into a Drakon, causing the Arcadians to flee in terror. After this victory, he became the patron and defender of the Eleans.