The Massacre of the Innocents is the biblical account of infanticide by Herod the Great, the Roman-appointed King of the Jews. According to the Gospel of Matthew, Herod ordered the execution of all young male children in the vicinity of Bethlehem, so as to avoid the loss of his throne to a newborn King of the Jews whose birth had been announced to him by the Magi. In typical Matthean style, it is understood as the fulfillment of an Old Testament prophecy:
“Then was fulfilled that which was spoken through Jeremiah the prophet, saying, ‘A voice is heard in Ramah, mourning and great weeping, Rachel weeping for her children and refusing to be comforted, because her children are no more.'”
The number of infants killed is not stated. The Holy Innocents, although Jewish, have been claimed as martyrs for Christianity, and the Feast of the Holy Innocents has long been celebrated.