1438 AD
Pachacuti begins his reign
An Inca ruler starts a period of major expansion.

- Time period
- 1438 AD
- Region
- Americas
- Theme
- Politics
- Civilization
- Inca
The conventional chronology places the start of Pachacuti's reign in 1438, though other dates have been proposed. He transformed the kingdom centered on Cusco into an expanding Inca empire.