Humayun is the second Moghul emperor of India. The intrigues of his brothers and Afghani lords compel him to seek exile in Persia, while his brother Kamran rules Kabul, keeping Humayun’s young son Akbar hostage.

Humayun is welcomed by the Persian king and in gratitude he present his precious diamond Koh-i-Noor to the Persian monarch. With the help of Persian troops, Humayun conquers Kabul and loses it twice, but finally frees it from the yolk of his brother, returning to India to reclaim his lost empire. Within a couple of years the Venus of his fortunes fades as he falls from the steps of his balcony while watching Venus in the sky.