Aristobulus of Chalcis was a son of
Herod of Chalcis and his first wife Mariamne. Herod of Chalcis was a grandson of
Herod the Great through his father,
Aristobulus IV. Mariamne was a granddaughter of Herod the Great through her mother, Olympias; hence Aristobulus was a great-grandson of Herod the Great on both sides of his family.