There are several interesting legends and mythological stories associated with raksha bandhan. Most of the raksha bandhan legends date back to the Hindu puranas and epics.
King Bali and Goddess Laxmi - In the story of King Bali and Goddess Laxmi, Goddess Laxmi went to Bali to seek refuge and tied rakhi on his hands on the day of shravan purnima.
Indra/Indrani and Yama/Yamuna - In the story of Indra and Indrani and Yama and Yamuna the vows of protecting the sister and the never-ending love have been re-emphasized.
King Porus and Alexander's wife Roxana - In the historical anecdote of King Porus and Alexander's wife Roxana, she had sent a rakhi to King Porus because of which Porus had retracted from the battlefield without harming Alexander.
Maharani Karnawati and Emperor Humayun - Maharani Karnawati and Emperor Humayun also find a place in the history of raksha bandhan legends when she had asked for help from Humayun by sending a rakhi.