Nalanda University was attacked three times. First attack was done by order of Brahmin General named Pushyamitra who took advantage of declining Mauryan dynasty and its weak rulers. It should be noted they attacked the university and the monks but not burnt down the libraries. The attack was against only the Buddhists. Guptas came to power after decline of Mauryan dynasty . When Guptas came to power they reconstructed the University and restored the glory of Nalanda once again. But after decline of Guptas dynasty, there was another which came to power in eastern India that was Gauda Dynasty (of present day Bengal). King Shashanka was one of the most powerful ruler of Gaudiya Dynasty. The development of the Bengali calendar is often attributed to Shashanka because the starting date falls within his reign. During his time, Buddhists were heavily persecuted and Nalanda University was attacked. In the inscriptions of Chinese monk Xuanzang ( who travelled to India during that period) mentio...