The bond between Rani Karnavati, the widowed queen of Chittoor king, and Mughal Emperor Humayun is an important evidence of Raksha Bandhan in Indian history. It was a time whenever Rajputs were warring against Mughal invasions, and Rakhi was considered a protection for sisters and gave a spiritual binding.
Rani Karnawati was unable to thwart the invasion of Bahadur Shah, the Sultan of Gujarat, and she had sent a Rakhi to Mughal emperor Humayun who was touched by her gesture and left with his troops to protect her life.