ante diem xii kalendas octobres

Mercatus -- after the completion of the ludi Romani, a few days were given over to restocking the cupboards

480 B.C. -- battle of Salamis (one reckoning)

356 B.C. -- birth of Alexander the Great (one reckoning)

91 B.C. -- death of the orator Lucius Licinius Crassus (one author of the Lex Licinia Mucia which aggravated Latin sentiments and contributed to the outbreak of the Social War)

19 B.C. -- death of Publius Vergilius Maro (maybe)

ca. 220 A.D. -- martyrdom of Theodore, Philippa, and companions