In the ancient Sanskrit literature, the name 'Pragjyotisha' was used as a designation for :

In ancient Sanskrit literature, Pragjyotisha was the designation for the region of Assam. It is prominently mentioned in the Epics (Mahabharata and Ramayana) and various Puranas. The term "Prag" signifies eastern and "jyotisha" refers to star or astrology, implying it was a center for astronomical studies. The capital, Pragjyotishpura, is widely identified with modern-day Guwahati. In the Mahabharata, the kingdom was ruled by Narakasura and his son Bhagadatta, who participated in the Kurukshetra War. In later historical periods, the region became known as Kamrupa. In contrast, Odisha was anciently known as Kalinga or Utkala, and Bihar was known as Magadha, Anga, or Mithila. This identification is well-documented in historical texts and official state records of Assam.