According to greekmythology.com (I'll keep their hyperlinks so you can refer to their webpage for further research.) Arion was an immortal horse in Greek mythology, which was very fast and bred by the gods. According to a source, it also had the ability to speak.
According to Thoughtco.com, Antaeus was the son of Gaia and Poseidon. He was a Libyan giant whose strength appeared to be invincible. Antaeus challenged all passers-by to a wrestling match which he invariably won. Upon winning, he always slaughtered his adversaries. That is until he met Hercules.
According to Earth-History.com The Anakim lived before the great flood and Noah's ark. The flood was apparently deliberate to clean the earth of these unholy creatures. Many say these beings were well documented and really lived. I'm here to talk about these creatures from a folkloric standpoint. If you believe they were real or if you believe this is heresy- in either case, this may not be the post for you. We are working up to a writing prompt here and this creature could be a great source of inspiration for your writing.
According to Wikipedia, the amphisbaena plural: amphisbaenae; is a real creature. A worm lizard native to South America and parts of Africa, the Middle East, and Mediterranean Europe.
Homer, according to Encyclopedia Britannica, lived in the 9th or 8th century bce?, In Ionia? [now in Turkey]), presumed author of the Iliad and the Odyssey