March 7th (321) was a Monday. It's the 66th day of the year (67th in leap years) in the Gregorian calendar. There are 299 days left to the end of the year.
Historical Events for 7th March, 321
» Emperor Constantine I decrees that the 'dies Sol Invictus or Solis Invicti' (Sunday or sun-day) is the day of rest in the Empire.
March 7th Holidays in History
» Christian feast day:
» Saints Perpetua and Felicitas named Perpetua and Felicitas