ante diem iii nonas martias

• Festival of Mars (day 5)
• 399 B.C. — death of Socrates (according to one reckoning)
• 13 B.C. — death of Marcus Aemilius Lepidus (the triumvir) (according to one reckoning)
• 51 A.D. — the future emperor Nero is coopted into all the priestly colleges