pridie kalendas septembres

• 12 A.D. — birth of the future emperor Gaius (Caligula) at Antium
• 40 A.D. — Gaius (Caligula) celebrates an ovatio after his attempted military campaigns in Gaul and Britain
• 161 A.D. — birth of the future emperor Commodus (and his twin, Titus Aurelius Fulvus Antoninus)

ante diem iii kalendas septembres

• 490 B.C. — battle of Marathon (according to some reckonings)
• 37 A.D. — dedication of the Temple of Augustus (and associated rites thereafter)

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

ante diem vii kalendas septembres

• 55 B.C. — Julius Caesar invades Britain, but doesn’t stick around very long
• 1875 — Birth of John Buchan, 1st Baron of Tweedsmuir and Governor-General of Canada … and author of a decent biography of Augustus

ante diem viii kalendas septembres

• Opiconsivia — rites in honour of Ops, an old Italian earth deity and usually considered the spouse of Consus
• 79 A.D. — death of Pliny the Elder in the wake of the eruption at Pompeii
• 325 A.D. — Council of Nicaea comes to an end, having come up with the Nicene Creed, the ‘Twenty Canons’, etc..