Yamaraja, or Dharmaraja, as the superintendent of death, has to judge the criminal living entities who have committed sinful activities throughout their lives. Consequently Yamaraja is expected to be most expert in judicial matters. Prthu Maharaja was also highly learned and exceedingly exact in delivering his judgment upon the citizens. No one could excel him in opulence any more than estimate the stock of minerals and jewels in the Himalaya Mountains; therefore he is compared to Kuvera, the treasurer of the heavenly planets. Nor could anyone discover the secrets of his life any more than learn the secrets of Varuna, the demigod presiding over the water, the night, and the western sky. Varuna is omniscient, and since he punishes sins, he is prayed to for forgiveness. He is also the sender of disease and is often associated with Mitra and Indra.