Achilleus in Wikipedia
Achilleus (fl. 3rd century AD) assumed the title of emperor
under Diocletian and reigned over Egypt for some time. He
was possibly the Corrector of Domitius Domitianus. He seems to
have succeeded the revolt started by Domitianus, after the
latter died.
Achilleus was at length taken by Diocletian after a siege of
eight months in Alexandria, and put to death in 296 AD.