saints or pirs. Deities such as Shitala (goddess of smallpox), Olabibi (goddess of cholera) and Manasa (goddess of snakes) became venerated as pirs. Under Mughal Empire In pre-Mughal times, there is less evidence for widespread adoption of Islam in what is now Bangladesh. What mention of Muslims there was usually in reference to an urban elite. Ibn Battuta met with Shah Jalal in Sylhet and noted the inhabitants of the plains were still Hindu. In 1591, Venetian traveller Cesare Federici mentioned Sondwip near Chittagong as having an entirely Muslim population. The seventeenth century European travellers generally understood Islam as being implanted after the Mughal conquest. During the Mughal Empire, much of the region of what is now East Bengal was still heavily forested, but highly fertile. The Mughals incentivised the bringing of this land under cultivation, and so peasants were incentivised to bring the land under cultivation. These peasants were primarily led by Muslim leaders and so Islam became the main religion in the delta. Most of the Zamindars in the modern Barisal division, for instance, were upper caste Hindus who subcontracted actual jungle clearance work to a Muslim pir. In other instances, pirs themselves would organise the locals to clear the jungle and then contact the Mughals to gain legitimacy. In other instances, such as the densely-forested interior of Chittagong, Muslims came from indigenous tribals who never followed Hindu rituals. In British India The British East India Company was given the right to collect revenue from Bengal and Bihar by the Treaty of Allahabad after defeating the combined armies of Nawab Mir Qasim of Bengal, Nawab of Awadh, and Mughal emperor at the Battle of Buxar. They annexed Bengal in 1793 after abolishing local rule (Nizamat). The British looted the Bengal treasury, appropriating wealth valued at US$40 billion in modern-day prices. Due to high colonial taxation, Bengali commerce shrank by 50% within 40 years, while at the same time British imports flooded the market. Spinners and weavers starved during famines and Bengal's once industrious cities became impoverished. The East India Company forced opium and indigo cultivation and the permanent settlement dismantled centuries of joint Muslim-Hindu political, military and feudal cooperation. The Bengal Presidency was established in 1765. Rural eastern Bengal witnessed the earliest rebellions against British rule, including the Faraizi movement led by Haji Shariatullah and the activities of Titumir. The mutiny of 1857 engulfed much of northern India