ante diem xiii kalendas martias
- Parentalia (Day 5) — the period for appeasing the dead continued
- Quirinalia — festival honouring the namesake of the Quirinal hill, the Sabine divinity Quirinus, who was later identified with Romulus. Little else is known about the festival.
- 304 A.D. — martyrdom of Donatus and 80+ others near Venice
- 1776 — Edward Gibbon publishes the first volume of the Decline and Fall of the Roman Empire