He assisted Rama, the 7th avatar of Vishnu in his quest to save his wife Sita from the rakshasa king Ravana.

[3] In the Ramayana, he helps Hanuman realise his potential, just before his famous leap over to the island of Lanka.

[3] Jambavan was present at the Samudra Manthana, and is supposed to have circled Vamana 21 times in a single leap, when he was acquiring the three worlds from Mahabali.

[5] In the epic Ramayana, Jambavan helped Rama find his wife Sita and fight her abductor, Ravana.

It is he who makes Hanuman realise his immense capabilities, and encourages him to fly across the ocean to search for Sita in Lanka.