All Saints' Day is a day to honor the Christian martyrs, beginning with the apostles and continuing through until today. In many cultures in the world, Christians are despised and killed because of their faith.

The holiday was first mentioned in the fourth century, and on this holiday in 609 or 610 A.D., Pope Boniface IV dedicated the Pantheon to the Virgin Mary, the mother of Jesus. All Saints' Day occurred on May 13th that year and continued on that day until 835 or 837 A.D. when Pope Gregory IV changed the date to November 1 and included all saints. Some believe he changed the date to November 1 to coincide with the pagan holiday of All Hallows Eve (Halloween). In some Eastern churches, it is observed on the Sunday after Pentecost.

Today only the Roman Catholics observe the holiday.