 He was only seventeen when he was crowned as the Nawab.He reigned under the regency of his mother and died of smallpox on March 10, 1770 during the Great Bengal famine of 1770.After the death of Najimuddin Ali Khan, his younger brother Najabat Ali Khan, better known as Saif ud-Daulah, succeeded him and was placed on the "Masnad" (throne) at the age of 17.