idus apriles
- ludi Cereri continue (day 2)– games in honour of the grain goddes Ceres, instituted by/before 202 B.C.
- rites in honour of Jupiter Victor and Jupiter Liber
- 150 A.D. — martyrdom of Carpus and companions at Pergamon
- 303 A.D. — martyrdom of Maximus and companions at Silistria