For constructing the medieval political history of Cooch Behar, also known as Koch Bihar, the Persian manuscript of BahÂristÂn-i-Ghaybī, discovered in 1919 by Jadunath Sarkar in the Bibliothèque Nationale of Paris, is very significant. This text facilitates our understanding of important historical events in eastern India during the time of Mughal Emperor Jahangir (1601–27). The text also provides important details of peasants’ revolts during the Mughal occupation, with remarkable implications until recent times regarding border relations between India and Bangladesh. The article examines the historical facts presented in this important text and corroborates them with other sources to argue that this text should be read as a chronicle for the history of warfare, society and peasants’ life in the region throughout the seventeenth century, with significant implications for later historical developments in Cooch Behar.