ante diem vi kalendas septembres
- Volturnalia — rites in honour of a divinity associated with fountains/waters
- 479 B.C. — Greek forces defeat Persian forces under Mardonius at Plataea (according to one reckoning)
- 413 B.C. — lunar eclipse which caused hesitation amongst Athenian forces under Nikias in Sicily; the subsequent delay ultimately led to their destruction
