idus septembres
- ludi Romani (day 9)
- epulum in honour of Minerva and others (connected to the ludi Romani)
- ritual of the ‘driving of a nail’ by the Pontifex Maximus/Rex Sacrorum into the Temple of Jupiter (likely connected to the above and below entries)
- 509 B.C. — dedication of the Temple of Jupiter Optimus Maximus (and associated rites thereafter; also incorporated into the ludi Romani, it seems)
- 490 B.C. — yet another reckoning for the Battle of Marathon
- 16 A.D. — revelation of the conspiracy of Lucius Scribonius Libo, leading to the first of the maiestas trials which characterized the emperor Tiberius’ principate
- 81 A.D. — death of the emperor Titus; his brother Domitian is acclaimed as emperor
- 122 A.D. — construction of Hadrian’s Wall begins? (I’m still wondering about the source for this claim)
