451

The year 451 started on Monday, January 1, and ended on Monday, December 31.

Calendar with holidays
Holidays:
 * New Year's Day: Monday, January 1
 * Epiphany: Saturday, January 6
 * Mardi Gras: Tuesday, February 20
 * Ash Wednesday: Wednesday, February 21
 * Palm Sunday: Sunday, April 1
 * Good Friday: Friday, April 6
 * Easter: Sunday, April 8
 * Halloween: Wednesday, October 31
 * Christmas Eve: Monday, December 24
 * Christmas: Tuesday, December 25
 * New Year's Eve: Monday, December 31