Centuries: 3rd century - 4th century - 5th century
Decades: 270s 280s 290s 300s 310s - 320s - 330s 340s 350s 360s 370s
Years: 321 322 323 324 325 - 326 - 327 328 329 330 331
Events
- September 14 - Discovery of the (alleged) True Cross by Helena, mother of Constantine the Great. (traditional date)
- First church built on the site of Vatican City, where St. Peter's tomb was supposed to be.
Deaths
- Crispus, son of Constantine the Great (executed)
- Fausta, second wife of Constantine the Great (executed)