Herod the Great was a king of Bethlehem. He plays a role in Jesus Christ’s story, for when He was young, Herod heard that there was a new ruler of Bethlehem. So, in anger, he demanded that all males under 2 were to be killed.
Herod was very strict and cruel and murdered anyone he suspected that would take his throne. This comes into play when he is told that there is a new ruler of Bethlehem.