On his coins, Arsaces I is depicted in apparel similar to Achaemenid satraps. According to A. Shahbazi, Arsaces deliberately diverges from Seleucid coins to emphasize his nationalistic and royal aspirations, and he calls himself Kārny/Karny (Greek: Autocrator), a title already borne by Achaemenid supreme generals, such as Cyrus the Younger. In line with Achaemenid traditions, rock-relief images of Arsacid rulers were carved at Mount Behistun, where Darius I of Persia (r. 522-486 BC) made royal inscriptions. Moreover, the Arsacids claimed familial descent from Artaxerxes II of Persia (r. 404-358 BC) as a means to bolster their legitimacy in ruling over former Achaemenid territories, i.e. as being legitimate successors of glorious kings of ancient Iran. Artabanus II named one of his sons Darius and laid claim to Cyrus' heritage. The Arsacid kings chose typical Zoroastrian names for themselves and some from the heroic background of the Avesta, according to V.G. Lukonin. The Parthians also adopted the use of the Babylonian calendar with names from the Achaemenid Iranian calendar, replacing the Macedonian calendar of the Seleucids.