Charles Ellicott Commentary 2 Kings 19:2

"And he sent Eliakim, who was over the household, and Shebna the scribe, and the elders of the priests, covered with sackcloth, unto Isaiah the prophet the son of Amoz." — 2 Kings 19:2 (ASV)

And he sent Eliakim ... —See the Note on 2 Kings 3:12; and compare with 2 Kings 13:14; 2 Kings 22:14; Jeremiah 37:3. Knobel (on Isaiah) remarks that this distinguished embassy speaks for the high estimation in which the prophet stood.

The elders of the priests — i.e., the heads of the sacerdotal caste (próceres, not senes).