- When Hanuman was returning from Lanka, his sweat went inside a crocodile and thus he had a son, named Makardhwaj.
- Makardwaj became the gatekeeper of the entrance of Patal Lok, assigned by Ahi Ravan and Mahi Ravan.
- When Hanuman came to Patal lok to rescue Ram and Lakshman from those Asuras, he had to first cross Makardwaj.
- When Makardwaj said that he was the son of Hanuman, Hanuman got angry, and there was a huge fight.
- Being the son of Hanuman, Makardwaj was nearly equal to Hanuman.
- Then after knowing everything, Hanuman left him.
- After that when Ahi Ravan and Mahi Ravan were killed by Prabhu Shri Ram with help of Hanuman, Hanuman made him the King of that part of Patal Lok