The Maurya Empire — India’s First Imperial Unification (c. 321–185 BC)

The last Mauryan emperor, Brihadratha, was assassinated by his commander-in-chief, Pushyamitra Shunga, during a military parade. Pushyamitra founded the Shunga Empire, which controlled central and northern India for the next century. The Maurya Empire — which had ruled for approximately 137 years and at its peak covered up to 5 million square kilometers (1.9 million square miles) with an estimated population of 15-30 million — came to an end.

Ashoka died after a 36-year reign. The empire fragmented within decades as his successors — Dasharatha, Samprati, Shalishuka, Devavarman, Shatadhanvan, and Brihadratha — lost control over the provinces. Secessionist movements emerged in Kalinga, the Deccan, and the northwest. The decline was accelerated by economic pressures from funding Ashoka's welfare programs and military demobilization.

Ashoka inscribed his policies of dhamma (moral law based on Buddhist principles) on pillars, rock faces, and cave walls throughout the empire. The Edicts of Ashoka — written in Prakrit, Greek, and Aramaic — promoted non-violence, religious tolerance, animal welfare, social welfare, and just administration. Ashoka also sent Buddhist missionaries to Sri Lanka, Southeast Asia, West Asia, and the Hellenistic kingdoms, contributing to Buddhism's transformation into a global religion. He established hospitals for humans and animals and created a cadre of dharma officers (dhamma-mahamattas) to oversee welfare.

Ashoka launched a brutal military campaign against the independent kingdom of Kalinga on the Bay of Bengal. The war resulted in approximately 100,000 deaths and 150,000 deportations. The scale of suffering profoundly changed Ashoka. Witnessing the carnage firsthand, he converted to Buddhism and renounced offensive warfare. The Kalinga War became a turning point in world history — the first recorded instance of a monarch rejecting conquest on moral grounds.

Ashoka, Bindusara's son, ascended the throne after a contested succession. Sources describe him as a fierce and ambitious prince who had served as governor of Taxila and Ujjain before consolidating power. His early reputation was that of a ruthless ruler — he was known as Chanda-Ashoka ("Ashoka the Fierce") before his transformation.

After reigning for approximately 24 years, Chandragupta voluntarily abdicated the throne in favor of his son Bindusara. According to Jain tradition, Chandragupta converted to Jainism, became an ascetic, and traveled south to Shravanabelagola, where he fasted until death. Bindusara, known as Amitraghata ("slayer of enemies"), expanded the empire southward into the Deccan plateau.

Chandragupta Maurya concluded a treaty with Seleucus I Nicator, the Greek ruler of the Seleucid Empire (successor state to Alexander's eastern conquests). Seleucus ceded the satrapies of Arachosia, Paropamisadae, and Gedrosia (modern Afghanistan and Balochistan) to Chandragupta in exchange for 500 war elephants. A marriage alliance was also established. The treaty fixed the Maurya Empire's northwestern border and opened diplomatic and trade relations with the Hellenistic world.

Chandragupta Maurya, aided by his advisor Kautilya (Chanakya) — author of the Arthashastra, a seminal treatise on statecraft — led a revolt against the unpopular Nanda king Dhana Nanda. After seizing the Nanda capital of Pataliputra, Chandragupta founded the Maurya dynasty and began unifying the fragmented kingdoms of northern India. The new empire inherited the Nanda's well-organized administrative and military infrastructure.