ante diem xviii kalendas januarias
- Consualia — a festival in honour of Consus which likely involved a similar celebration to that held on August 21 (i.e. horse races, chariot races, and garlanding of the steeds)
- 337 B.C. — death of Timoleon (according to one reckoning)
- 19 B.C. — dedication of the Ara Fortunae Reducis
- 37 A.D. — birth of the future emperor Nero
- 130 A.D. — birth of the future co-emperor Lucius Verus
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