1) All Saints' Day, also called All Hallows, was designated by Pope Gregory III in the eighth century to take place on Nov. 1.
2) This Christian holiday, largely observed by Cathloics, is designed to honor all saints and martrys, known and unknown.
3) The evening before was known as All Hallows Eve and later Halloween, and is thought to have stemed from the Celtic festival of Samhain.
4) In early days Christians celebrated the anniversary of a martyr's death, but when the persecution of Diocletian occurred there were so many martyrs that a specifc day couldn't be given to each of them. Eventually, a day to honor all was appointed.
5) All Saints' Day is followed by All Souls' Day on Nov. 2 every year.