Overview

The Matsyanyaya ('law of the fishes') was a period of political anarchy in Bengal lasting roughly 637–750 CE, between the Gauda Kingdom's dissolution after Shashanka's death and the founding of the Pala dynasty by Gopala c. 750 CE. The term, borrowed from the Arthashastra's analogy of large fish preying on small ones, was used by later Bengali tradition to describe the era of internal conflict and lack of central authority. Bengal was contested between various regional chiefs and the heirs of Harsha and Bhaskaravarman.

Territory Phases

1. Post-Shashanka Interregnum (Immediate Fragmentation)637 CE – 650 CE

   The immediate post-Shashanka fragmentation phase (c. 637–650 CE) covers the period following the death of Shashanka and the brief, unsuccessful reign of his son Manava (~8 months). Harsha of Kannauj moved quickly to assert suzerainty over western Bengal while Bhaskaravarman of Kamarupa seized Karnasuvarna (the Gauda capital in western Bengal) and Pundravardhana. The core Gauda heartland around Karnasuvarna (near Murshidabad) and the western Vanga zone lost centralized political authority, with multiple local principalities emerging in the Gangetic delta. The polygon is contracted relative to Gauda's peak extent, reflecting the rapid loss of Shashanka's westward Bihar gains and the eastern territories to Bhaskaravarman. The period is attested through later sources including the Khalimpur Copperplate's reference to matsyanyaya, Majumdar's reconstruction (History of Bengal Vol. I), and the HCIP Vol. IV account of the Age of Imperial Kanauj. Harsha's death in 647 CE removed even the nominal external overlordship, deepening Bengal's fragmentation.

2. Post-Shashanka Interregnum (Prolonged Instability)650 CE – 750 CE

   The prolonged regional instability phase (c. 650–750 CE) covers the century of fragmented political authority across all three major divisions of Bengal. Following Harsha's death in 647 CE and the dissolution of his empire, Bengal lost even its nominal external overlord. The Gauda region (western Bengal), Vanga (central and southern Bengal), and Samatata (eastern and coastal Bengal) each hosted competing local chieftains and samantas who ruled their own domains without central coordination. The polygon extends broadly to represent the full geographic zone of this contested space, including Samatata in the east (modern coastal Bangladesh). No single polity claimed supreme authority. Taranatha's History of Buddhism in India describes confusion in Bengal during this era, and the Ramacaritam by Sandhyakaranandin evokes the political conditions of Bengal preceding the Pala rise. Ray's History of the Bengali People (1994) synthesizes evidence for the social and political organization under local samantas and chieftains. The Khalimpur Copperplate of Dharmapala explicitly characterizes this period as matsyanyaya — 'the law of the fishes' from Kautilya's Arthashastra — in which powerful actors preyed on weaker ones.

3. Post-Shashanka Interregnum (Transition to Pala Rule)750 CE – 751 CE

   The transition phase (c. 750 CE) is a single-year marker representing the moment when Gopala I was elected by the regional chieftains (prakriti) of Gauda and Varendra to end the matsyanyaya interregnum. The polygon contracts from the broad instability phase to the Gauda/Varendra region (northern Bengal, centered on the Varendra-Pundravardhana area) where Gopala's election is recorded as taking place. The Khalimpur Copperplate of Dharmapala (Gopala's son) explicitly records that the prakriti — the regional chieftains — collectively selected Gopala (son of Vapyata, son of Dayitavishnu) to restore order. This act of political election, unusual in Indian political history, ended the interregnum without major military resistance. Gopala founded the Pala dynasty, which would rule Bengal and parts of northeastern India for four centuries, with its first capital at the Gauda/Varendra core before subsequent expansion under Dharmapala.

Key Events

Related Civilisations

Sources

1. Majumdar, R.C. (1943) History of Bengal, Vol. I
2. Sandhyakaranandin (ed. Haraprasad Sastri; rev. Radhagovinda Basak) (1969) Ramacaritam(12th-century Sanskrit kavya by Sandhyakaranandin, court poet of the Pala king Ramapala. Uses matsyanyaya imagery to characterize political disorder during the late Pala period (c. Ramapala's reign); scholars invoke it to demonstrate the term's currency in Bengali political discourse. The poem covers Ramapala's reconquest from the Kaivarta rebels, not the 7th-8th century interregnum itself. First edited by Haraprasad Sastri (1910); this revised edition by Radhagovinda Basak includes an English translation.)
3. Ray, Niharranjan (1994) History of the Bengali People (Ancient Period)(English translation by John W. Hood of Niharranjan Ray's 'Bangalir Itihas: Adiparba' (Bengali, original 1949). Comprehensive social and political history of Bengal from ancient times to the fall of the Sena dynasty. Standard reference for 7th-8th century Bengal.)
4. Chattopadhyaya, B.D. (1994) The Making of Early Medieval India(Standard secondary work on post-Gupta political formation in eastern India including Shashanka's state-formation context; widely cited in peer-reviewed scholarship.)
5. Kautilya; edited, rearranged, and translated by L.N. Rangarajan (1992) The Arthashastra
6. Khalimpur Copper-Plate Inscription of Dharmapala(Key Pala inscription recording the legitimation narrative: Gopala elected during a period of anarchy (matsya-nyaya). Provides the earliest genealogy of the Pala dynasty.)
7. Taranatha (1608) History of Buddhism in India(Tibetan Buddhist historian's account of Indian Buddhism, compiled 1608. Records Pala patronage of Nalanda and Vikramashila, Dharmapala's foundation of Vikramashila, and the later decline of Buddhism in eastern India.)
8. Majumdar, R.C. (ed.) (1955) The History and Culture of the Indian People, Vol. IV: The Age of Imperial Kanauj(The canonical HCIP volume covering the Tripartite Struggle period. Comprehensive coverage of Pratihara, Pala, and Rashtrakuta political history. Primary authority for inter-dynastic chronology.)