comprising Bihar and Bengal. It was one of the four main kingdoms of India at the time of the lives of Mahavira, the principal figure of Jainism and Gautama Buddha, founder of Buddhism. It consisted of several janapadas, or kingdoms. Under Ashoka, the Maurya Empire of Magadha in the 3rdcentury BCE extended over nearly all of South Asia, including Afghanistan and parts of Balochistan. From the 3rd to the 6thcenturies CE, the kingdom of Magadha served as the seat of the Gupta Empire. Two kingdoms—Vanga or Samatata, and Gauda—are said in some texts to have appeared after the end of the Gupta Empire although details of their ascendancy are uncertain. The first recorded independent king of Bengal was Shashanka, who reigned in the early 7thcentury. Shashanka is often recorded in Buddhist annals as an intolerant Hindu ruler noted for his persecution of the Buddhists. He murdered Rajyavardhana, the Buddhist king of Thanesar, and is noted for destroying the Bodhi tree at Bodhgaya, and replacing Buddha statues with Shiva lingams. After a period of anarchy, the Pala dynasty ruled the region for four hundred years beginning in the 8thcentury. A shorter reign of the Hindu Sena dynasty followed. Rajendra Chola I of the Chola dynasty invaded some areas of Bengal between 1021 and 1023. Islam was introduced through trade with the Abbasid Caliphate. Following the Ghurid conquests led by Muhammad bin Bakhtiyar Khalji and the establishment of the Delhi Sultanate, it spread across the entire Bengal region. Mosques, madrasas and khanqahs were built throughout these stages. During the Islamic Bengal Sultanate, founded in 1352, Bengal was a major world trading nation and was often referred by the Europeans as the richest country with which to trade. Later, in 1576, it was absorbed into the Mughal Empire. Medieval and early modern periods Subsequent Muslim conquests helped spread Islam throughout the region. It was ruled by dynasties of the Bengal Sultanate and feudal lords under the Delhi Sultanate for the next few hundred years. The Bengal Sultanate was interrupted for twenty years by a Hindu uprising under Raja Ganesha. In the 16thcentury, Mughal general Islam Khan conquered Bengal. Administration by governors appointed by the court of the Mughal Empire gave way to semi-independence under the Nawabs of Murshidabad, who nominally respected the sovereignty of the Mughals in Delhi. Several independent Hindu states were established in Bengal during the Mughal period, including those of