Adam Clarke on Daniel 2:14

Captain of the king's guard - Chief of the king's executioners or slaughter men. Margin, רב תבחיא rab tabachaiya, chief of the butchers, he that took off the heads of those whom the king ordered to be slain, because they had in any case displeased him. "Go and bring me the head of Giaffer." The honorable butcher went and brought the head in a bag on a dish. It was Herod's chief butcher that brought the head of John the Baptist in a dish to the delicate daughter of Herodias. This was the custom of the country. No law, no judge, no jury. The will or caprice of the king governed all things. Happy England! know and value thy excellent privileges!