Mir Jafar was the first Nawab of Bengal under British influence. An Arab by birth, he rose to power
in the Nawab's army and in the battle of Plassey (1756) he conspired with the British to depose Siraj-Ud-Dullah to become the Nawab himself.
Mir came to India as a penniless adventurer but won confidence of Nawab Alivardi Khan to rise to
the post of Bakshi. He gained reputation as a brave military personnel, playing prominent role
in many of Nawab's military campaigns. He rescued Nawab's nephew Saulat Jung in Katak and also defeated the Marathas. However he proved his cowardliness by escaping from Medinipur on hearing the advances of the Maratha forces. He then conspired with Ataullah to overthrow the Nawab but the plan was unearthed and he was dismissed.
Nevertheless that did not stop Mir to carry on with his designs. Alivardi's grandson Siraj-Ud-Dullah came to the throne and he again conspired, this time with Shawkat Jang to invade Bengal. However, the treachery became known to Siraj again and he demoted him and replaced him with Mir Madan as the Bakshi. On 1756. Siraj won the Cossimbazar factory from the British and then advanced towards Calcutta but the British soon retaliated and Siraj was compelled to flee to Murshidabd.
He sought help of Mir Jafar who assured him of his help against the British.
In actual, Mir had secretly made a pact with British to overthrow Siraj in lieu of the promise that he would made the Nawab of Bengal.
The British force under Robert Clive marched to Murshidabad and met Siraj in the Battle of Plassey in 1757. Mir's army betrayed Siraj by not fighting for him and Siraj was defeated and killed. Mir was
crowned as the new Nawab of Bihar, Orissa and Bengal.
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