Dara Shikoh
Dara Shikoh, also known as Dara Shukoh ,
(20 March 1615 – 30 August 1659) was the eldest son and heir-apparent of the Mughal emperor Shah Jahan.
Dara was designated with the title "Padshahzada-i-Buzurg MartabaPrince of High Rank") and was favoured as a successor by his father and his older sister, Princess Jahanara Begum.
In the war of succession which ensued after Shah Jahan's illness in 1657, Dara was defeated by his younger brother Prince Muhiuddin (later, the Emperor Aurangzeb).
He was executed in 1659 on Aurangzeb's orders in a bitter struggle for the imperial throne.
Dara was a liberal-minded unorthodox Muslim as opposed to the orthodox Aurangzeb.
A great patron of the arts, he was also more inclined towards philosophy and mysticism rather than military pursuits.
The course of the history of the Indian subcontinent, had Dara Shikoh prevailed over Aurangzeb, has been a matter of some conjecture among historians.
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Sulaiman Shikoh
Sulaiman Shikoh  was a Mughal prince and the eldest son of Crown prince Dara Shikoh.
He was executed in May 1662 at Gwalior Fort on the orders of paternal uncle, Emperor Aurangzeb.
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Question: Who is the paternal grandfather of Sulaiman Shikoh?
Answer: Shah Jahan