believed that one of the adventurers encountered the Saka dynasty of Bangal another, Nanyadeva, founded the Carnatic dynasty of Mithila with its capital at Siaraon on the India-Nepal border.
Medieval period
Between 1211 and 1226, Ghyasuddin Iwaz, the Muslim governor of Bengal, attempted to invade Tirabhukti and Tirhut. His successors were only able to claim Tirhut from Narsinghdeva, a Simyaon king, in about 1323.
As Harsinghdeo, the last Simyaon king, had taken shelter in Nepal, Kameshwar Thakur, a Brahman, was crowned king in his place. The Sugaon dynasty held Tirhut as a tributary province for a century after Harsinghdeo's capture. The most famous of this dynasty was Raja Shiva Singh who was adorned by the immortal poet laureate Vidyapati.
During the period of Lakshmi Nath, Deva Tirabhukti was attacked by Sultan Alleuddin Hussain Shah of Bengal and Sikandar Lodi of Delhi. A treaty was concluded in 1499 according to which Tirabhukti was left to Delhi. Subsequently, Delhi attacked Tirabhukti and made the prince a tributary chief. However, Nasrat Shah, son of Allauddin Shah, attacked Tirabhukti in 1530 and annexed the territory, killed the Raja and thus put an end to the Thakur dynasty.
Nasrat Shah appointed his son-in-law as viceroy of Tirhut and the governate was ruled by a Muslim. In 1526, Babur dynasted Sikandar Lodi but Champaran did not regain prominence until the last days of the Muslim rule.
During the close of the Mughal empire, Champaran witnessed ravages of contending armies. Prince Al Gauhar, later known as Shah Alam, invaded Bihar in 1760 and Khadin Hussain, the Governor of Purnit was invited with his army to join him. Nawab Sirajudaulla of Bengal had already been defeated and killed as a result of the conspiracy of Mir Jagarkhan and the British, in June, 1757. Before Khadim Hussain could meet Shah Alam's forces Captain Knox led a British force
