The Decline of the Indus Valley Civilization
The decline of the Indus Valley Civilization (IVC), a complex process that occurred between c. 1900 BCE and 1300 BCE, marks the transition from a highly urbanized, integrated culture to a more rural and fragmented one, known as the Late Harappan or post-urban phase.
- Timeline of Decline: The mature, urban phase of the IVC flourished from c. 2600 BCE to 1900 BCE. The decline was not a sudden collapse but a gradual process of de-urbanization. By 1800 BCE, major cities like Mohenjo-Daro and Harappa showed signs of decay, and by 1700 BCE, most of them were abandoned. The population dispersed into smaller settlements in the east and south.
- The Aryan Invasion Theory:
- This theory was prominently put forward by archaeologists like R.E. Mortimer Wheeler in the mid-20th century. He connected the literary evidence from the Rigveda, which describes the Aryan god Indra as “Purandara” (destroyer of forts), with the archaeological evidence of fortified Harappan cities. He also cited the discovery of several unburied skeletons in the upper levels of Mohenjo-Daro as proof of a violent invasion and massacre.
- Rejection of the Theory: This theory is now largely discredited. Scholars like George F. Dales (“The Mythical Massacre at Mohenjo-Daro,” 1964) demonstrated that the skeletons did not belong to a single event and lacked evidence of violent trauma consistent with a massacre. Furthermore, there exists a significant chronological gap of at least two centuries between the decline of urban IVC (c. 1800 BCE) and the earliest plausible date for Indo-Aryan presence in the region (c. 1500 BCE).
- Climate Change and Ecological Factors (The Most Accepted Theory): This is a multifactorial explanation, widely supported by recent palaeoclimatological studies.
- Prolonged Drought: Research by institutions like IIT Kharagpur (e.g., Anindya Sarkar et al., 2016) has analyzed oxygen isotopes in snail shells from ancient lake sediments (like Kotla Dahar near Bhirrana). The findings indicate a significant weakening of the Indian Summer Monsoon and the onset of a prolonged period of aridity starting around 2200 BCE, which would have severely impacted the rain-fed agriculture that sustained the civilization.
- Changes in River Systems:
- Drying of the Ghaggar-Hakra River: This river system, often identified with the mythical Saraswati River of the Vedas, was a lifeline for numerous Harappan settlements like Kalibangan and Banawali. Geological and hydrological studies suggest that tectonic shifts caused its major tributaries, the Sutlej and the Yamuna, to be captured by the Indus and Ganga river systems, respectively. This led to the gradual drying of the Ghaggar-Hakra, rendering the region inhospitable for large urban populations. The work of Pakistani archaeologist M. Rafique Mughal in the Cholistan desert has documented the abandonment of sites along this river bed.
- Flooding and Shifting of the Indus: In contrast, cities in the Indus Valley proper, such as Mohenjo-Daro, faced the problem of catastrophic floods. Excavations have revealed thick layers of silt, indicating repeated inundations that would have destroyed agricultural lands and urban infrastructure.
- Consequences: These ecological pressures led to a decline in agricultural surplus, which was the backbone of the urban economy. This, in turn, caused a breakdown of trade networks, the decline of craft specialization, and the decay of civic authority. The population migrated towards the Gangetic plains in the east and into Gujarat in the south, where they established smaller, agrarian settlements, marking the beginning of the Late Harappan phase.
Profile of Major Cities of IVC
- Harappa: The first site to be excavated, giving the civilization its name. Discovered by Daya Ram Sahni in 1921.
- Location: On the banks of the river Ravi, in Punjab, Pakistan.
- Key Findings: Two rows of six granaries with ‘working floors’ for threshing grain, sandstone statues of a male torso and a dancer, evidence of a ‘H’ cemetery culture in its late phase, and terracotta figurines. The discovery of its bricks by railway engineers in the 19th century first brought the site to light.
- Mohenjo-daro: The largest city of the IVC, excavated by R.D. Banerji in 1922. Its name means “Mound of the Dead.”
- Location: On the banks of the river Indus, in Sindh, Pakistan.
- Key Findings: The Great Bath (a large public water tank for ritualistic purposes), the Great Granary (the largest building), a bronze statue of a ‘Dancing Girl’ (made using the cire perdue or lost-wax technique), a steatite statue of a bearded man often called the ‘Priest-King’, and the famous ‘Pashupati Seal’ depicting a seated figure surrounded by animals, which Sir John Marshall interpreted as a proto-Shiva.
- Dholavira: A major city known for its unique planning and water management, excavated by R.S. Bisht from 1990 onwards.
- Location: In the Rann of Kutch, Gujarat, India.
- Key Findings: Declared a UNESCO World Heritage Site in 2021. It had a unique three-part division: a fortified Citadel, a Middle Town, and a Lower Town. It possessed an exceptionally sophisticated water conservation system with a series of large reservoirs and dams to harvest rainwater. A unique ‘signboard’ with ten large Harappan signs was also discovered.
- Banawali: Excavated by R.S. Bisht.
- Location: In Hisar district, Haryana, India.
- Key Findings: Evidence of both pre-Harappan and Harappan cultures. The town layout is semi-radial, which is a departure from the typical grid pattern of other Harappan cities. A significant find is a high-quality terracotta model of a plough, providing insight into agricultural technology. Large quantities of barley grains were also found.
- Surkotada: A coastal town excavated by J.P. Joshi.
- Location: In Kutch, Gujarat, India.
- Key Findings: Famous for the find of horse remains (bones), dated to c. 2000 BCE. This finding is contentious; some scholars like A.K. Sharma identify them as horse bones, while others like archaeozoologist Richard Meadow argue they belong to a variety of wild ass (onager).
- Lothal: A key port city, excavated by S.R. Rao.
- Location: At the confluence of the Sabarmati river and the Gulf of Khambhat, Gujarat, India.
- Key Findings: An artificial brick dockyard, the world’s earliest known, connected to an ancient course of the Sabarmati river. Evidence of extensive maritime trade, including a Persian Gulf seal. Finds include fire altars, rice husks, a double burial (male and female in a single grave), and a terracotta game board resembling modern chess.
- Kalibangan: The name translates to “black bangles.” Excavated by B.B. Lal and B.K. Thapar.
- Location: On the banks of the now-dry Ghaggar river, in Rajasthan, India.
- Key Findings: Evidence of the world’s earliest attested ploughed field (from the pre-Harappan level), a series of seven fire altars in a row on the citadel, suggesting ritualistic practices, and evidence of a destructive earthquake.
- Chanhudaro: Excavated by N.G. Majumdar and later Ernest Mackay.
- Location: In Sindh, Pakistan.
- Key Findings: It was a major centre for craft production, often referred to as the “Lancashire of India” for the IVC. Evidence of factories for bead-making, shell-working, and seal-making. Notably, it is the only Harappan city without a fortified citadel.
- Shortughai: A Harappan trading outpost.
- Location: In northern Afghanistan, near the Oxus (Amu Darya) river.
- Key Findings: Strategically located to control the trade in Lapis Lazuli, a semi-precious blue stone sourced from the nearby mines of Badakhshan. Evidence of a Harappan colony with typical pottery and seals.
- Manda: Northernmost site of the IVC. Located on the right bank of the Chenab river in Jammu and Kashmir.
- Sutkagendor: Westernmost site of the IVC. Located on the Makran coast in Balochistan, Pakistan. It functioned as a sea-port and trading post.
- Kot Diji: Located on the left bank of the Indus river, opposite Mohenjo-Daro, in Sindh, Pakistan. A well-defined pre-Harappan culture existed here, which was destroyed by a massive fire before the mature Harappan phase.
- Alamgirpur: Easternmost site of the IVC. Located on the Hindon river (a tributary of the Yamuna) in Uttar Pradesh. It represents the late, decadent phase of the civilization.
The Vedic Age
Sources about the Vedic Age
- Shruti vs. Smriti: Vedic literature is classified into two broad categories.
- Shruti (“that which is heard”): Considered eternal, authorless, and divinely revealed. It comprises the four Vedas.
- Smriti (“that which is remembered”): Composed by human sages and derived from the Shruti. It includes texts like the Vedangas, Dharmashastras (e.g., Manusmriti), Puranas, and the epics (Ramayana and Mahabharata).
- The Four Vedas:
- Rigveda (c. 1500-1000 BCE): The oldest Veda and the earliest surviving text in any Indo-European language. It is a collection of 1028 hymns (suktas) arranged into 10 books (mandalas). Mandalas 2 to 7 are the oldest and are known as the “family books” as they are attributed to specific families of seers. Mandalas 1 and 10 are the youngest additions.
- Samaveda: The “Veda of Melodies.” Its hymns are mostly borrowed from the Rigveda and are arranged with musical notations (saman) to be chanted during Soma sacrifices. It is a foundational text of Indian classical music.
- Yajurveda: The “Veda of Sacrificial Formulas.” It is a prose manual for priests, detailing the procedures for performing various sacrifices (yajnas). It has two main recensions: the Krishna (Black) Yajurveda and the Shukla (White) Yajurveda.
- Atharvaveda (c. 1000-600 BCE): The latest of the four Vedas. It is a collection of spells, incantations, and charms to ward off evil spirits and diseases, reflecting popular beliefs and folk traditions. It is considered by some scholars, like Michael Witzel, to contain significant non-Aryan influences.
- Structure of each Veda: Each Veda is further divided into four parts:
- Samhita: The core collection of hymns or mantras.
- Brahmana: Prose commentaries explaining the meaning and rituals of the hymns.
- Aranyaka: “Forest texts,” which are mystical and philosophical treatises, often seen as a bridge between the ritualism of the Brahmanas and the philosophy of the Upanishads.
- Upanishad: “Sitting near,” these are philosophical texts that discuss concepts like Brahman (the ultimate reality) and Atman (the individual soul), forming the basis of Vedanta philosophy.
- Dating the Vedic Age: The Early Vedic Age (c. 1500-1000 BCE) is associated with the composition of the Rigveda Samhita. The Later Vedic Age (c. 1000-600 BCE) corresponds to the composition of the other Vedas and the entire corpus of Brahmanas, Aranyakas, and Upanishads.
Identity and Life of the Aryans
- The Term ‘Aryan’: It is primarily a linguistic term, popularized by 19th-century philologists like Max Müller, referring to speakers of Indo-Aryan languages, a sub-branch of the Indo-European family. It is not a racial category.
- Key Characteristics of Early Vedic People:
- Domestication of the Horse: The horse (ashva) was central to their culture, used for mobility and warfare.
- Spoked-Wheel Chariots: Their horse-drawn chariots with spoked wheels gave them a significant military advantage over people using solid-wheeled carts.
- Metallurgy: Early Vedic texts mention ayas which likely refers to copper or bronze. The use of iron (krishna ayas or shyama ayas) became widespread only in the Later Vedic period (from c. 1000 BCE).
- Rituals: A strong cult of fire (Agni) and the ritualistic consumption of a drink called Soma. Animal sacrifices, including the horse sacrifice (Ashvamedha), were central to their religion.
- Disposal of the Dead: Cremation was the usual practice, distinct from the burial practices of the Harappans.
- Geography: The Rigveda describes the geography of the Sapta Sindhu region (land of seven rivers), which corresponds to the Punjab and its tributaries. The Vedic names for these rivers are: Indus (Sindhu), Jhelum (Vitasta), Chenab (Asikni), Ravi (Parushni), Beas (Vipah), and Sutlej (Shutudri). The Saraswati (Ghaggar-Hakra) was considered the most sacred river.
- Tribal Structure:
- The Rigveda mentions numerous tribes (jana). The five most important were collectively called the Panchajana: Yadu, Turvasha, Puru, Anu, and Druhyu.
- Battle of Ten Kings (Dasarajna Yuddha): Described in the 7th Mandala of the Rigveda, this was a major battle fought on the banks of the river Parushni (Ravi). The Bharata king Sudas defeated a confederacy of ten kings, including the Panchajana. This victory established the political dominance of the Bharata tribe.
- Formation of the Kurus: Subsequently, the victorious Bharatas allied with the defeated Purus to form a new, powerful tribe known as the Kurus, who would play a central role in the Later Vedic period.
- Indigenous Peoples: The Rigveda frequently mentions non-Aryan peoples, the Dasa and Dasyu, as enemies. They are described as dark-skinned, snub-nosed, non-sacrificing, and speakers of a different language (mridhravacha). This distinction was initially ethno-cultural but laid the foundation for later social stratification.
Early Vedic Economy (Pastoral-Agrarian)
- The economy was predominantly pastoral, with cattle being the chief measure of wealth. A wealthy person was called gomat. The term for war was gavishti (“search for cows”).
- Agriculture was a secondary occupation. The main crop was barley (yava). The plough (langala) was known. Land was held communally by the tribe, and the concept of private property in land had not yet developed.
Early Vedic Polity (Tribal Chiefdom)
- The political structure was that of a tribal chiefdom. The chief, called Rajan, was primarily a protector of the tribe (Gopati Janasya) and a leader in war.
- The Rajan’s position was often hereditary but not absolute. His power was checked by popular tribal assemblies:
- Sabha: A smaller body of select tribal elders.
- Samiti: A larger assembly of the entire tribe.
- Vidhata: Possibly the oldest assembly, with diverse functions including redistribution of spoils.
- Women’s Participation: Women were allowed to attend the Sabha and Vidhata, indicating a higher status than in later periods.
- Taxation and Army: There was no regular system of taxation. People gave voluntary offerings or tribute called Bali to the Rajan. There was no standing army; the tribe mobilized its militias (gana, vrata, sardha) in times of war.
- Officials: The two most important functionaries were the Purohita (chief priest) and the Senani (leader of the army).
Early Vedic Society and Religion
- Social Structure: Kinship was the basis of the social structure. The hierarchy was Kula (family) < Grama (village/kin-group) < Vish (clan) < Jana (tribe). People’s primary loyalty was to their jana.
- Varna System: The Varna system was in its nascent stage. The term varna in the Rigveda is used for ‘colour’ or ‘class’. The famous Purushasukta in the 10th Mandala (a later addition) gives a mythological origin for the four social orders (Brahmana, Kshatriya, Vaishya, Shudra) from the sacrifice of a primeval man. However, during the Early Vedic period, this division was likely fluid and based on occupation, not heredity. A hymn in the 9th Mandala states, “I am a poet, my father is a physician, and my mother is a grinder of corn,” illustrating social mobility.
- Family and Status of Women: The society was patriarchal, with the father as the head of the family (kulapa). The birth of a son was desired for continuing the family line. However, women enjoyed considerable freedom. They had access to education (evidenced by female seers like Lopamudra, Ghosha, Apala), participated in assemblies, and could choose their partners. Child marriage was absent, and widow remarriage (niyoga) was permitted.
- Religion:
- Dharma: The concept of Dharma was not ‘religion’ but referred to one’s duty and the upholding of the universal natural law, Rita.
- Nature Worship: The Vedic people personified the forces of nature and worshipped them as gods. There were no temples or idol worship.
- Major Deities:
- Indra: The most frequently mentioned god; god of rain, thunder, and war. He is also called Purandara (breaker of forts).
- Agni: The second most important god; the god of fire, acting as an intermediary between gods and humans.
- Varuna: The upholder of the cosmic order (Rita).
- Soma: God of plants and an intoxicating drink used in rituals.
- Goddesses like Usha (dawn), Aditi (mother of gods), and Saraswati (river goddess) were also worshipped.
- Mode of Worship: Worship consisted of the collective recitation of prayers and the performance of sacrifices (yajna) to please the gods, primarily for material gains like progeny (praja) and cattle (pashu).
Prelims Pointers
- Decline of IVC: Began around 1900-1800 BCE.
- Aryan Invasion Theory: Propounded by Mortimer Wheeler; largely rejected.
- Accepted Theory for Decline: Climate change, drying of the Saraswati (Ghaggar-Hakra) river, and floods in the Indus region.
- Harappa: Located on the Ravi river; known for granaries and ‘H’ cemetery culture.
- Mohenjo-daro: Located on the Indus river; known for the Great Bath, Great Granary, Bronze Dancing Girl, and Pashupati Seal.
- Dholavira: Located in Gujarat; a UNESCO site known for its unique three-part division and advanced water management system.
- Banawali: Located in Haryana; known for a terracotta plough model and a radial street pattern.
- Surkotada: Located in Gujarat; site with evidence of horse bones.
- Lothal: Located in Gujarat; a port town with an artificial dockyard and evidence of rice husks.
- Kalibangan: Located in Rajasthan on the Ghaggar river; known for the earliest ploughed field and fire altars.
- Chanhudaro: Located in Pakistan; major craft centre, city without a citadel.
- Shortughai: IVC trading outpost in Afghanistan for Lapis Lazuli.
- IVC Boundaries:
- Northernmost: Manda (Jammu & Kashmir)
- Southernmost: Daimabad (Maharashtra)
- Easternmost: Alamgirpur (Uttar Pradesh)
- Westernmost: Sutkagendor (Pakistan)
- Vedas: Rigveda is the oldest; Samaveda is for chants; Yajurveda for rituals; Atharvaveda for spells and charms.
- Shruti: Divinely revealed texts (the four Vedas).
- Smriti: Human-authored texts (Epics, Puranas).
- Rigvedic Rivers:
- Jhelum: Vitasta
- Chenab: Asikni
- Ravi: Parushni
- Beas: Vipah
- Sutlej: Shutudri
- Battle of Ten Kings (Dasarajna): Fought on the river Parushni (Ravi) between King Sudas and a confederacy of ten tribes.
- Early Vedic Assemblies: Sabha, Samiti, Vidhata.
- Early Vedic Tax: Bali (voluntary offering).
- Early Vedic Gods: Indra (chief god), Agni (intermediary), Varuna (cosmic order).
- Purushasukta Hymn: Mentioned in the 10th Mandala of the Rigveda; describes the origin of the four varnas.
Mains Insights
- Historiographical Debates on IVC’s Decline: The debate has shifted from monocausal, dramatic theories like the Aryan invasion to complex, multi-causal environmental explanations. This reflects a more nuanced understanding of historical processes, integrating archaeological data with scientific evidence from palaeoclimatology and geology. The rejection of the invasion theory also has significant political and cultural implications for the “Aryan migration” debate and the continuity of Indian civilization.
- Continuity and Discontinuity from IVC to Present Urbanization:
- Continuity: The Harappan emphasis on sanitation (covered drains), water management (reservoirs in Dholavira), and a grid-based street layout can be seen as foundational principles for modern urban planning. The use of standardized burnt bricks also continues. Certain religious symbols (e.g., swastika, pipal tree worship) and practices may have survived.
- Discontinuity: Modern urbanization is driven by industrial and service economies, unlike the agrarian-surplus-based economy of the IVC. Modern cities are far larger and more complex, with a highly differentiated administrative structure, unlike the relatively homogenous Harappan cities.
- Vedic Age as a Foundational Period:
- Polity: The Early Vedic polity, with its checks on the Rajan’s power through assemblies like the Sabha and Samiti, can be seen as an early form of democratic or oligarchic ethos. The transition to the territorial monarchies of the Later Vedic period marks a crucial shift in Indian political thought.
- Society: The evolution of the Varna system from a flexible, occupation-based classification in the Early Vedic age to a rigid, hereditary caste system in later periods is a central theme in Indian social history. Understanding its origins in the Purushasukta and its initial fluidity is crucial to analyzing the long-term trajectory of social stratification and inequality in India.
- Philosophy and Religion: The Vedas laid the philosophical groundwork for much of later Indian thought. The speculative nature of the Upanishads, questioning rituals and focusing on concepts like Brahman and Atman, directly led to the rise of diverse philosophical schools and heterodox religions like Buddhism and Jainism.