The "Mahabharata" mentions Shaiva ascetics, such as in chapters 4.13 and 13.140. Other evidence that is possibly linked to the importance of Shaivism in ancient times are in epigraphy and numismatics, such as in the form of prominent Shiva-like reliefs on Kushan Empire era gold coins. However, this is controversial, as an alternate hypothesis for these reliefs is based on Zoroastrian Oesho. According to Flood, coins dated to the ancient Greek, Saka and Parthian kings who ruled parts of the Indian subcontinent after the arrival of Alexander the Great also show Shiva iconography, but this evidence is weak and subject to competing inferences.