78Centuries: 1st century BC - 1st century - 2nd century
- Romans conquer the Ordovices, located in present-day northern Wales, as well as the Silures.
- Agricola replaces Frontinus as governor of Roman Britain.
- Indian Prince Aji Caka introduces Sanskrit language and Pallawa script, used to inscribe Javanesenese words and phrases, to the Indonesian islands. The base year for the Saka era
For the number 78, see seventy-eight.