Innocents' Day, alternatively known as Childermas, is a Christian holiday that commemorates the martyrdom of the young male children at the hands of King Herod in Bethlehem. There are a few synonyms for this occasion, including Holy Innocents' Day, Feast of the Holy Innocents, and Children's Mass. The day is also referred to as the Massacre of the Innocents, which highlights the brutal killing of innocent children. Although it is not a widely celebrated holiday, Innocents' Day serves as a reminder of the tragic event that contributed to the biblical story of Jesus' birth.