The author continues to give background information about Herod and the beheading of John the Baptist. (See: [[rc://en/ta/man/jit/writing-background]])
Here the word "he" refers to Herod and is a metonym for his servant whom he would have commanded to prepare a meal. Alternate translation: "he had a dinner made for his officials ... of Galilee" or "he invited his officials ... of Galilee to eat and celebrate with him"