The demon Naraka
The name of an asura in the Puranic telling, also the Sanskrit word for hell.
In the Puranic story Krishna defeats the demon Naraka, and the day after is kept as Naraka Chaturdashi, with a bath before dawn and a lamp. Accounts of the story differ between texts.
Diwali is a five-day season at the Kartika new moon (October-November). This sets out the days, the Padma Purana and al-Biruni, and which stories are later.
The sacred katha from the Brahmanda Purana of King Vaikhanasa delivering his ancestors, celebrated concurrently with Gita Jayanti in Margashirsha Shukla Paksha.
The divine katha from the Brahmavaivarta Purana of the fierce hunter Krodhana who controlled and destroyed all his sins like an elephant goad (Ankusha) on Papankusha Ekadashi in Ashvina Shukla Paksha.