Siraj-Ud-Daulah was a Mughal ruler who also became the Nawab of Bengal in the 1756 AD. He succeeded Alivardi Khan. He was also known as Mirza Mohammad Sirajud British East India Company`s rule commenced with the end of his rule. He was also known as Sir Roger Dowlett by several British.

His father was Zain ud din, who was the ruler of Bihar and his mother Amina Begum was Nawab Alivardi Khan`s youngest daughter. In the year 1752, Alivardi Khan officially announced his grandson Siraj-Ud-Daulah as the successor and Crown Prince to the throne. His nomination to the nawabship triggered the enmity and jealousy of Ghaseti Begum, who was the eldest sister of the mother of Siraj, British East India Company, Raja Rajballabh and Shawkat Jang (the cousin of Siraj). The Battle of Plassey is widely regarded as the turning point in the history of India. It helped open the doors to the British to have their hold on India. After the conquest of Kolkata by Siraj-Ud-Daulah, the British retaliated by sending fresh set of troops from Chennai to regain control of the fort and take revenge of the attack. In the Battle of Plassey he was deceived by a conspiracy of Mir Jafar, Umi Chand, Jagat Seth, Krishna Chandra thereby to the British and Siraj escaped to Murshidabad and then he went to Patna with the help of a boat, but was finally arrested by the soldiers of Mir Jafar. He was executed on the 2nd of July, 1757 by Mohammad Ali Beg.

Siraj-Ud-Daulah is considered as a freedom fighter in Bangladesh, Pakistan and modern India because of his strong opposition to the British annexation. In his teens, Siraj was a reckless fellow, which dragged the notice of his grandfather. But a promise made by him to his great grandfather on his death bed, he abandoned the drinking and gambling habits completely after he became the Nawab. Siraj-Ud-Daulah was a furious fighter against the pirates of Southern Bengal and the Marathas during the 1740s, but he was fully routed by the huge British soldiers and the treachery of his near and dear ones.