This planet was rich in kironide deposits.
Prior to stardate 5784, this planet was unknown to the Federation. Scans of this planet revealed no intelligent life signs. This ability to hide their life signs would later be attributed to the psychokinetic powers of the Platonians.
The Platonians colonized this planet thousands of years ago. Before they arrived at Platonius, they spent time on Earth and embraced the ancient Greek civilization. When this civilization ended, they left to create a society based on this civilization. The Platonians established a republic based on the writings of the philosopher Plato, a disciple of Socrates. They named the planet after Plato.