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