Inca Empire (Tawantinsuyu)
A vast Andean state that ran an empire without money or writing, held together by roads, labour service, and khipu records.
c. 1438 – 1533 CE
The Andes along western South America, from modern Colombia to central Chile
Economy
The Inca economy operated almost entirely without money or markets, organised instead around reciprocal labour and state redistribution. Households owed the mit'a, a rotational labour tax spent on state fields, roads, mines, and military service, while the state maintained vast storehouses (qollqa) stocked with maize, freeze-dried potatoes (chuño), and textiles for redistribution and emergencies. Land was divided notionally among the community, the state, and the cult of the sun, and vertical control of ecological tiers from coast to highland gave communities access to complementary crops.
Law
Law in Tawantinsuyu was administrative and customary rather than codified, enforced through a pyramidal hierarchy of officials reaching down to the kuraka headmen and the decimal units that grouped households for tax and control. The state prized order highly, and offences such as theft, laziness, or rebellion were punished severely, sometimes by death, with the crime weighed against the offender's rank and circumstances. Inspectors (tokoyrikoq, 'those who see all') travelled the provinces to audit officials and ensure obligations were met.
Education
Formal schooling was reserved for the elite: noble boys studied for several years in the yachaywasi ('house of knowledge') at Cusco under teachers called amauta, learning Quechua rhetoric, religion, history, and the use of the khipu. Selected girls, the aqllakuna or 'chosen women', were trained in weaving, brewing, and ritual service in special enclosures. For most people, knowledge and skills passed through the household and community by oral instruction and apprenticeship rather than schooling.
Army
The Inca fielded a large conscript army raised through the mit'a and led by a professional noble officer corps, expanded dramatically under Pachacuti and his successors Topa Inca and Huayna Capac. Warriors fought with slings, star-headed maces, spears, and quilted armour, and the state's real strategic strength lay in its logistics: roads, storehouses, and fortresses like Sacsayhuamán above Cusco. Conquest often mixed force with diplomacy, and rebellious populations could be forcibly resettled as mitmaq colonists to break resistance and secure new territory.
Religion
Inca religion centred on the worship of Inti, the sun, from whom the ruling dynasty claimed descent, alongside the creator Viracocha and the earth-mother Pachamama. The landscape itself was sacred, dotted with huacas—shrines, springs, and stones—linked to Cusco by radiating ceque lines, and dead emperors were mummified and honoured as living presences with their own estates and attendants. Ritual offerings ranged from coca, chicha beer, and llamas to the rare high-mountain child sacrifice known as capacocha, evidenced by preserved bodies on Andean peaks.
Architecture
Inca architecture is renowned for its precision-fitted ashlar masonry, in which enormous polygonal stones were dressed to lock together without mortar, as at Sacsayhuamán and the temple complex of the Coricancha in Cusco. Trapezoidal doorways, niches, and windows lent structures their characteristic look and helped them resist earthquakes, while terracing (andenes) reshaped whole mountainsides for farming. The royal estate of Machu Picchu, built in the fifteenth century under Pachacuti, remains the most celebrated demonstration of this integrated landscape engineering.
Trade
Because the state absorbed and redistributed so much surplus, there was little of the market exchange familiar elsewhere; movement of goods was dominated by state logistics rather than private merchants. The backbone was the Qhapaq Ñan, a road network of some 40,000 km spanning deserts, gorges, and high passes, served by relay runners (chaski) who carried messages and light goods, and by way-stations (tampu) that lodged travellers and troops. Llama caravans moved bulk goods such as maize, textiles, and metals between ecological zones, integrating the empire economically without coinage.
Technology
Lacking writing and the wheel, the Inca kept accounts and possibly narratives on the khipu, a system of knotted, coloured cords that encoded numbers in a decimal, positional form and much administrative data besides. They were master metallurgists in gold, silver, bronze, and copper, expert weavers of fine cumbi cloth, and skilled at freeze-drying food and building suspension bridges of woven grass across Andean gorges. Their genius lay in organising labour and environment—terracing, irrigation, and storage—to sustain millions across one of the harshest landscapes on earth.