Ardashir's petroglyphs are clearly different from the few remaining Parthian samples and a new historic frame is seen in them. His first three petroglyphs have various styles, but do not show a clear evolutionary procedure. Only the fourth petroglyph, the picture of Ardashir's coronation in Naqsh-e Rustam, possesses clear features that reappears in the petroglyphs of Shapur I and his successors. Numismatics The coins minted in Ardashir's period are divided into three general groups based on the applied designs: The first group is the coins that show a full-face portrait of Ardashir on the coin and a profile of Papak, Ardashir's father who looks left due to the Parthians, behind the coin. The phrase "Ardashir Shah" is written on these coins with the phrase "His Majesty Papak Shah" behind. The second group have the profile of Ardashir wearing a hat or crown looking right similar to other coins of the Sasanian era. Behind the second group coins, a symbol of the firebox of the fire temple is seen like in all the coins of the Sasanian era. On the second group of the coins, the phrase "The worshiper of Mazda, his majesty Ardashir the Iranian shahanshah who has his face from the gods" is written that shows Ardashir's religious beliefes. On the third group of the coins, the picture of Ardashir is carved in front of the picture of his son, Shapur, with the phrases "Shapur the Iranian shah who has his face from the gods" and "Ardashir's fire". The firebox of the fire temple is carved behind the coins. The symbol behind the second group coins is a fireplace carving based on a design found in Persia and the phrase "Ardashir's fire" implies a royal fire that was ignited in the beginning of every shah's reign. The section of the supporting basis of the fireplace has some similarity to the Achaemenid throne. Some hanging bands are carved in the end of an open headband, which is the royal symbol in Persian traditions. Therefore, the petroglyphs behind these coins show Ardashir's concern for showing himself not only as the Achaemenids' rightful heir, but also as a religious Zoroastrian. In the makeup of head and hair, Ardashir was loyal to the Parthian traditions in the first coins and chose a crown similar to the crowns of Mithridates II's period. However, in the final years, Ardashir's main crown was from a type