There is a story connecting Hanuman with the origin of Navratri. It is mentioned in some puranas. Ravana was an ardent devotee of Shiva and Parvati. Pleased with the devotion, Shiva and Parvati were ever present in Lanka and were protecting the kingdom. When the tyranny of the Ravana became unbearable, Brahma asked Shiva and Parvati to stop protecting Ravana.
As a solution, Shiva promises Brahma that he will incarnate in the form of Hanuman to help Sri Ram defeat Ravana. Goddess Parvati agreed to leave the
arrives on Lanka. kingdom
To gather information about Mata Sita, Hanuman enters Lanka in a tiny form. On the island, Hanuman comes across the temple of a three-eyed Goddess and eight yoginis. Hanuman is stopped by the Goddess, who is a manifestation of Goddess Parvati.
Hanuman immediately shows his true form and Goddess Parvati recognizes Shiva.
Hanuman then requests the Goddess to stop protecting the island. As long as She is present on the island, Sri Ram will not be able to defeat Ravana.
Before leaving the island, the Goddess ask for a boon that the nine nights of worship should occur in autumn as well as spring. Hanuman agrees to this. From that day onward, Navratri which was originally celebrated only in Chaitra Month became more popular in the Ashwin month.