British person, who had been granted a knighthood. Thus she became, at that time, the only female knight in the entire British Empire besides Queen Victoria. Among the relatively minor rewards, a territory was restored to her, that she had earlier lost to a neighbouring prince. Sikandar ruled until 1868, when Shah Jehan succeeded her and was Begum until 1901. In 1901, Shah Jehan's daughter Kaikhusrau Jahan became Begum, ruled until 1926, and was the last of the female line of succession. In 1926, she abdicated in favour of her son, Hamidullah Khan, who ruled until 1947, and was the last of the sovereign Nawabs. The rule of Begums gave the city its waterworks, railways, a postal system, and a municipality constituted in 1907. Post independence Bhopal State was the second-largest Muslim-ruled princely state: the first being Hyderabad. After the independence of India in 1947, the last Nawab expressed his wish to retain Bhopal as a separate unit. Agitations against the Nawab broke out in December 1948, leading to the arrest of prominent leaders including Shankar Dayal Sharma. Later, the political detainees were released, and the Nawab signed the agreement for Bhopal's merger with the Union of India on 30 April 1949. The Bhopal state was taken over by the Union Government of India on 1 June 1949. Bhopal gas tragedy In early December 1984, a Union Carbide pesticide plant in Bhopal leaked around 32 tons of toxic gases, including methyl isocyanate (MIC) gas which led to the worst industrial disaster in the world to date. The official death toll was initially recorded as around 4,000. A Madhya Pradesh government report stated 3,787 deaths, while other estimates state the fatalities were significantly higher (16,000) from the accident and the medical complications caused by the accident in the weeks and years that followed. The higher estimates have been challenged by Union Carbide, however, medical staff in the city were not able to adequately record data due to the massive influx of patients. The impact of the disaster continues to this day in terms of psychological and neurological disabilities, blindness, skin, vision, breathing, and birth disorders. The soil and ground water near the factory site have been contaminated by the toxic wastes. The Bhopal disaster continues to be the part of the socio-political debate; the clean-up of environmental contamination and rehabilitation of those affected continues to challenge the people of Bhopal. The