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Herod I or Herod the Great (c. 72 – c. 4 BCE) was a Roman Jewish client king of the Herodian kingdom of Judea. He is known for his colossal building projects. Among these works are the rebuilding of the Second Temple in Jerusalem and the expansion of its base—the Western Wall being part of it. Many of the crucial details of his life are recorded in the works of the 1st century CE Roman–Jewish historian Josephus.
Despite Herod's successes, including forging a new aristocracy, he has been criticized by various historians. His reign polarizes historians' opinions, as some view it as successful, and some consider it to have been tyrannical.
Herod the Great is described in the Christian Bible as the coordinator of the Massacre of the Innocents. Most other New Testament references to 'Herod' are either to his son Herod Antipas (such as the events leading to the executions of John the Baptist and Jesus of Nazareth in Matthew 14), or his grandson Herod Agrippa (in Acts 12). Upon Herod's death, the Romans divided his kingdom among three of his sons and his sister: his son Herod Antipas received the tetrarchy of Galilee and Peraea.
Other family members of Herod the Great include Herod's son Herod Archelaus, who became ethnarch of Judea, Samaria, and Idumea; Herod's son Philip who became tetrarch of territories north and east of the Jordan River; and Herod's sister Salome I, who was given a toparchy including the cities of Jabneh, Ashdod, and Fasayil (Phasaelis).
General info from Wikipedia.org