ante diem xiii kalendas sextilias

ludi Victoriae Caesaris (day 1)

1262 B.C. -- based on the 'Canicular Cycle' (a.k.a. the Sothic cycle) of the Egyptians, this day is suggested for the foundation of the Pythian Games and the embarkation of Jason and the Argonauts (!)

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

64 A.D. -- the Great Fire of Rome (day 3)

1304 -- birth of Petrarch