Zoroaster Street and Madison Avenue in Manhattan. A sculpture of Zoroaster appears with other prominent religious figures on the south side of the exterior of Rockefeller Memorial Chapel on the campus of the University of Chicago. Although a few recent depictions of Zoroaster show the prophet performing some deed of legend, in general the portrayals merely present him in white vestments (which are also worn by present-day Zoroastrian priests). He often is seen holding a "baresman" (Avestan; Middle Persian "barsom"), which is generally considered to be another symbol of priesthood, or with a book in hand, which may be interpreted to
Zoroaster 330 BCE. The Seleucid rulers who gained power following Alexander's death instituted an "Age of Alexander" as the new calendrical epoch. This did not appeal to the Zoroastrian priesthood who then attempted to establish an "Age of Zoroaster". To do so, they needed to establish when Zoroaster had lived, which they accomplished by (erroneous, some even identified Cyrus with Vishtaspa) counting back the length of successive generations, until they concluded that Zoroaster must have lived "258 years before Alexander". This estimate then re-appeared in the 9th- to 12th-century Arabic and Pahlavi texts of Zoroastrian tradition, like the 10th century Al-Masudi