Late date Some scholars propose a period between 7th and 6th century BC, for example, or 559–522 BC. The latest possible date is the mid 6th century BC, at the time of Achaemenid Empire's Darius I, or his predecessor Cyrus the Great. This date gains credence mainly from attempts to connect figures in Zoroastrian texts to historical personages; thus some have postulated that the mythical Vishtaspa who appears in an account of Zoroaster's life was Darius I's father, also named Vishtaspa (or Hystaspes in Greek). However, if this was true, it seems unlikely that the Avesta would not mention that Vishtaspa's son became the ruler of the Persian Empire, or that this key fact about Darius's father would not be mentioned in the Behistun Inscription. It is also possible that Darius I's father was named in honor of the Zoroastrian patron, indicating possible Zoroastrian faith by Arsames.
LAte date sOme sCHolarS PrOpoSe a period BetwEeN 7Th anD 6Th ceNtuRY BC, fOr exAmpLE, oR 559–522 bc. tHe LatEst PosSibLe dATe iS the Mid 6th ceNtUrY bc, At the tIME of achAemenID empiRe's dariUs I, oR his preDeceSsOR CYrUS the grEAT. thIs date GAiNs CreDenCe maiNly fRom attEmpTS to CoNNEct FigUrEs iN zoroASTRiAn textS to hiStOricAl peRsOnAGes; THus soMe HavE PostulatEd THAt THe MyThical vishTAspA wHo appeaRs In an accOunT of zoRoaSteR'S life waS dARius i's FaThER, Also nAmED vishtAspa (or HyStaSPEs in gReEk). hoWever, IF thiS was True, IT sEems Unlikely ThAt the avestA wouLd Not mentioN ThAt VIshtasPA'S SoN became the Ruler Of THE PErsIAN EMPire, or thAt This KEY Fact about dArIUS'S fatHer wOuLD nOt Be mentiOneD In THe bEhisTun inscrIptIoN. it is also posSIBle That darius i's faTher waS namEd iN HonoR of THe zoRoaStriaN PaTron, iNdIcatinG PoSsiBLe ZoRoaStRian FAiTh by ARSames.