when they had called to the king - Hezekiah did not make a personal appearance, but commissioned his three principal ministers to meet the Assyrian deputies at a conference outside the city walls.
Eliakim - lately promoted to be master of the royal household (Isa 22:20).
Shebna - removed for his pride and presumption (Isa 22:15) from that office, though still royal secretary.
Joah ... the recorder - that is, the keeper of the chronicles, an important office in Eastern countries.