Smerdis

Bardiya (?-522BCE), also known as Smerdis, son of Cyrus the Great, younger brother of Cambyses the Second, possibly murdered by Cambyses the Second, then perhaps impersonated by Gaumata the Magian, who is said to have ruled Persia in Bardiya's name, until Bardiya/Smerdis/Gaumata was most certainly killed and supplanted by Darius the Great, who described his victory in great detail, in a tri-lingual inscription carved into Mount Behistun.

Borges says that "Smerdis the Magi" is the only recognizable historical figure in the entry on Uqbar found in Bioy Casares' copy of The Anglo-American Cyclopaedia. Borges notes that even this reference was made in a metaphorical sense. Which stands to reason since the term describes a person who never was: either there existed Smerdis son of Cyrus, or there was Gaumata the Magian - so "Smerdis the Magi" has to be a fiction of one sort or another. Which is exactly what Darius has been accused of creating, in order to justify his taking of the Empire from the seed of Cyrus the Second, he had to slay a son and then call him an imposter.