ante diem vi idus decembres
- Rites in honour of Tiberinus and Gaia — not a lot is known about these rites; Tiberinus had a temple on the Tiber island and presided over the Tiber (of course); Gaia seems to have originally given the Campus Martius (a.k.a. Campus Tiberinus) to the Roman people.
- 65 B.C. — birth of the poet Horace (Quintus Horatius Flaccus)