Harappan civilization: town planning

The Harappan Civilization’s (c. 2600–1900 BCE) most distinctive feature is its highly planned urban layout. Cities were typically divided into a raised Citadel (administrative/religious structures) and a lower residential town, with streets laid out in a grid pattern intersecting at right angles. Mohenjo-daro’s Great Bath — brick-built, waterproofed with bitumen — is generally interpreted as a structure for ritual bathing. Every house had its own drainage channel connecting to covered main-street drains — an unusually advanced public sanitation system for its time. Lothal’s dockyard and granaries point to organised trade and surplus storage. Standardised cubic stone weights (typically chert) appear uniformly across the whole civilization zone, suggesting some form of centralised economic regulation, even though no evidence of a single ruler or capital has been found.

Ashokan edicts, and Rock Edict XIII

The edicts of the Mauryan emperor Ashoka (c. 268–232 BCE) fall into three main groups — Major Rock Edicts, Minor Rock Edicts, and Pillar Edicts — written in Brahmi (and in Kharosthi and Greek/Aramaic in the northwest). Major Rock Edict XIII is generally considered the most significant: it directly describes the Kalinga War, records Ashoka’s own remorse over the massive loss of life, and announces his policy of Dhamma — moral/religious conquest (Dhamma-vijaya) in place of military conquest (digvijaya). The edict also names contemporary Greek rulers (such as Antiochus II), giving historians a rare, externally verifiable reference point for dating ancient Indian chronology.

Gupta Empire: coins and administration

The Gupta Empire (c. 319–550 CE) is particularly known for its gold coins (Dinara), modelled on the Roman denarius and reflecting the empire’s economic prosperity. Samudragupta’s coinage includes several distinct types — the Archer type, the Lyrist type (reflecting his interest in music), and the Ashvamedha type. Chandragupta II’s (Vikramaditya’s) coinage is best known for the Lion-slayer type. Administratively, the Allahabad Prashasti (composed by Harisena, inscribed on a pillar) is the single most important source for Samudragupta’s conquests. Key Gupta administrative posts included the Kumaramatya (high civil official), Akshapataladhikrita (superintendent of records), and Bhandagaradhikrita (treasurer) — the growing practice of land grants (like agrahara and brahmadeya) is exactly why record-keeping posts like these became so important, since every grant needed a durable, disputable-in-court written record.

Jainism, Buddhism & the Ajivikas — heterodox sects

Around the 6th century BCE, several heterodox (nastika — not accepting the Vedas’ authority) movements arose against the complexity of Vedic ritual and the rigidity of the varna system. Mahavira (the 24th and last Tirthankara) systematised Jainism — ahimsa (non-violence), anekantavada (many-sidedness of truth), and rigorous asceticism are central to it; it later split into the Svetambara and Digambara sects. Gautama Buddha taught the Four Noble Truths and the Eightfold Path, and founded the Sangha (monastic community) — socially radical for its time because membership crossed caste lines. The Ajivika sect, led by Makkhali Gosala, was built around the doctrine of Niyati (fatalism) — the belief that every event is predetermined and human effort has no influence on it — fundamentally different from both Buddhism’s and Jainism’s karma-based free-will frameworks.

Sangam age: polity & literature

Sangam literature (roughly 3rd century BCE–3rd century CE) is a vast body of ancient Tamil poetry, mainly collected in the Ettutokai (Eight Anthologies) and the Pattupattu (Ten Songs) — the primary literary source for early South India. Politically, this era saw three major dynasties (the Muventar) — the Cheras, Cholas, and Pandyas — ruling over Tamil territory, each with its own royal emblem (Chera: bow, Chola: tiger, Pandya: fish). The roots of local administrative assemblies (like the later Chola-period Ur and Sabha) trace back to this period. Sangam literature also classifies society into geographic-cultural zones (tinai), each with its own dominant mood and economy — such as kurinji (hills), marutam (farmland), and neidal (coastal).