Muhi us-Sunnat
Shahzada Muhammad Muhi us- Sunnat Mirza was the eldest surviving son of Prince Muhammad Kam Bakhsh, himself the youngest son of Emperor Aurangzeb.
He was imprisoned in the Palace- Prison of Salimgarh after his fathers defeat in 1709 at the hands of his brother, Emperor Bahadur Shah I, in a war of succession.
He remained in prison until his death on 29 January 1747, during the reign of Muhammad Shah.
His only son Prince Muhi ul- Millat was raised the throne in December 1759 as Shah Jahan III by the Grand Vizier Imad ul- Mulk Ghaziuddin Khan Feroz Jung III, but was deposed the following year by the Marathas.
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Aurangzeb
Muhi-ud-Din Muhammad (3 November 16183 March 1707), commonly known by the sobriquet Aurangzeb (Persian: "Ornament of the Throne") or by his regnal title Alamgir (Persian: "Conqueror of the World"), was the sixth Mughal emperor, who ruled over almost the entire Indian subcontinent for a period of 49 years.
Widely considered to be the last effective ruler of the Mughal Empire, Aurangzeb compiled the Fatawa-e-Alamgiri, and was among the few monarchs to have fully established Sharia law and Islamic economics throughout the Indian subcontinent.
He was an accomplished military leader whose rule has been the subject of praise, though he has also been described as the most controversial ruler in Indian history.
He was a notable expansionist; during his reign, the Mughal Empire reached its greatest extent, ruling over nearly all of the Indian subcontinent.
During his lifetime, victories in the south expanded the Mughal Empire to 4 million square kilometres, and he ruled over a population estimated to be over 158 million subjects, with an annual revenue of $450 million (more than ten times that of his contemporary Louis XIV of France), or £38,624,680 (2,879,469,894 rupees) in 1690.
Under his reign, India surpassed Qing China to become the world's largest economy and biggest manufacturing power, worth nearly a quarter of global GDP and more than the entirety of Western Europe, and its largest and wealthiest subdivision, the Bengal Subah, signaled the proto-industrialization.
Aurangzeb was noted for his religious piety; he memorized the entire Quran, studied hadiths and stringently observed the rituals of Islam.
Unlike his predecessors, including his father Shah Jahan, Aurangzeb considered the royal treasury to be held in trust for the citizens of his empire.
He did not enjoy a luxurious life and his personal expenses and constructions of small mosques were covered by his own earnings, which included the sewing of caps and trade of his written copies of the Quran.
He also patronized works of Islamic and Arabic calligraphy.
Aurangzeb has been subject to criticism.
Critics argue that his policies abandoned his predecessors' legacy of pluralism and religious tolerance, citing his introduction of the "jizya" tax and other policies based on Islamic ethics, demolition of Hindu temples, the executions of his elder brother Dara Shikoh, Maratha king Sambhaji and the ninth Sikh guru Tegh Bahadur, and the prohibition and supervision of behaviour and activities that are forbidden in Islam such as music, gambling, fornication, and consumption of alcohol and narcotic.
Various historians question the historicity of the claims of his critics, arguing that his destruction of temples has been exaggerated, and noting that he also built temples, paid for their maintenance, employed significantly more Hindus in his imperial bureaucracy than his predecessors did, and opposed bigotry against Hindus and Shia Muslims.
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Shah Jahan III
Shah Jahan III( 1711 – 1772),( شاه جہاں ۳) also known as Muhi -ul- millat was Mughal Emperor briefly.
He was the son of Muhi-us- sunnat, the eldest son of Muhammad Kam Bakhsh who was the youngest son of Aurangzeb.
He was placed on the Mughal throne in December 1759 as a result of the intricacies in Delhi with the help of Imad- ul- Mulk.
He was later deposed by Maratha Sardars.
Muhammad Kam Bakhsh
Muhammad Kam Bakhsh (7 March 1667 – 14 January 1709) was the youngest son of Emperor Aurangzeb, born to his concubine Udaipuri Mahal.

Question: Who is Muhammad Kam Bakhsh's paternal grandfather?
Answer: Shah Jahan