Either of two answers is acceptable. The troops of Siraj ud-Daulah kept British prisoners of war at Fort William in the so-called Black Hole of Calcutta. Give either Siraj's title (a five-letter word literally meaning "viceroy") or the province that (like Orissa) holders of Siraj's position ruled
(The last [BLANK] of [BLANK] was Mansur Ali Khan, who abdicated and whose son, Hassan Ali Mirza, took a somewhat lesser title named for the town of Murshidabad.)
Nawab (of) Bengal