During the last days of Shah Jahan, there was a contest for the throne amongst his four sons.

• Dara Shukoh, the eldest, was the favourite of his father. He had been nominated as heir apparent, a fact resented by his brothers.
• Dara Shukoh, who lost the battle for the throne of Delhi to his brother Aurangzeb, was known as the Philosopher Prince.
• He brought different cultures into dialogue and found a close connection between Hinduism and Islam. He translated the Upanishads from Sanskrit to Persian.

Source: Tamil Nadu state board.