Eutropius, Abridgement of Roman History — Book IX (1886<!-- translation -->)
“ XXVIII Diocletian lived to an old age in a private station, at a villa which is not far from Salonae, in honourable retirement, exercising extraordinary philosophy, inasmuch as he alone of all men, since the foundation of the Roman empire, voluntarily returned from so high a dignity to the condition of private life, and to an equality with the other citizens. That happened to him, therefore, which had happened to no one since men were created, that, though he died in a private condition, he was enrolled among the gods. ”
