Noun (Mas. 1st Decl.)
Perseus Dictionary Entry (Liddell and Scott [and Jones]'s Greek-English Lexicon, 9th ed., 1925-1940)
Not in L-S-J: Ἡρῴδης
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The Herod in Matthew 2 and Luke 1:5, who killed all the male children in Bethlehem (Mt. 2:16), is Herod the Great, called King Herod (Ἡρῴδης ὁ βασιλεὺς).
The Herod in Matthew 14, Mark 6, and Luke 23, who killed John the Baptist and who oversaw Jesus' execution with Pilate, is Herod Antipas, a.k.a. Herod the Tetrarch (Ἡρῴδης ὁ τετραάρχης), one of the three sons among whom Herod the Great's kingdom was divided.
King Herod in Acts 12 is Herod Agrippa I, grandson of Herod the Great. The title of "King" was denied to Herod the Great's sons Herod Archelaus (Mt. 2:22), Herod Antipas (Mt. 14; Mk. 6; Lk. 9, 23), and Herod Philip (Lk. 3:1), but restored by Roman emperor Caligula to his grandson Herod Agrippa I.
King Agrippa in Acts 25-26 (Ἀγρίππας ὁ βασιλεὺς), who interviewed Paul, is Herod Agrippa II, son of Herod Agrippa I.
Occurrences in the GNT
Occurrences in the LXX