The Feast of the Holy Innocents is a Christian feast in remembrance of the massacre of young children in Bethlehem by King Herod the Great in his attempt to kill the infant Jesus.
Why is it important?
The slain children were regarded by the early church as the first martyrs, but it is uncertain when the day was first kept as a saint's day. It may have been celebrated with Epiphany, but by the 5th century it was kept as a separate festival. In Rome it was a day of fasting and mourning.
The feast, also known as Childermas is observed by Western churches on December 28 and in the Eastern churches on December 29.