Inca Quipu Recording System

Timeline

1. 1438–1532Cusco · PeruThe Inca Empire (Tawantinsuyu) employed quipucamayocs (quipu officials) to manage knotted-string record-keeping; quipus recorded census data, grain reserves, tax collection, and military organization. Through the road system (qhapaq ñan), quipu information was relayed rapidly to the provinces, forming an efficient pre-literate information-management system.
2. 1532–1575Viceroyalty of Peru · Spanish coloniesAfter Pizarro's conquest of the Inca Empire in 1532, Spanish chroniclers such as Garcilaso de la Vega and Father Acosta began recording the functions and uses of quipus; some quipucamayocs turned to colonial service, continuing to use quipus in local administration, though the system began facing pressures of cultural rupture.
3. 1601–1610Viceroyalty of Peru · Spanish coloniesIn the early 17th century, colonial authorities and the Catholic Church classified some quipus as 'idolatry' or tools of secret communication, destroying large numbers during repeated extirpación de idolatrías campaigns. Meanwhile, some Andean communities secretly preserved quipus, continuing their use in local rituals and record-keeping, forming a covert tradition resisting cultural erasure.
4. 1990Academic institutions worldwideScholars such as Gary Urton of Harvard University have built quipu databases, using computational linguistics to analyze the logic of knot encoding, and have proposed that quipus may have served both numerical and narrative functions. About 1,000 quipus are held in museums worldwide; a complete decipherment remains an unsolved mystery.