King of the snakes, father of Ulupi. She had a son, Iravan, with Arjuna.
The snakes taught Arjuna to stay under water for a long time and gave him the protection not to be attacked by any aquatic dweller
To read the story visit
http://hindumythologyforgennext.blogspot.com/2012/05/arjuna-and-uloopi-part-1-of-2.html