There was a real-life ancient Greek hero who was transformed into a dolphin - Apparently.
In ancient Greek mythology, Delphin, a young fisherman, was transformed into a dolphin by the sea god, Poseidon, as a reward for his bravery. According to legend, Delphin was a mortal who showed great respect and devotion to the sea and its creatures, and as a result, Poseidon granted him a new form, allowing him to swim and hunt like a dolphin. This mythological tale has been documented in various ancient Greek sources, including the writings of the Greek historian, Herodotus.