They proclaimed a fast
Or called a court, (See Gill on 1 Kings 21:9).
and set Naboth on high among the people;
placed him at the bar as a criminal, (See Gill on 1 Kings 21:9), though Josephus F3 thinks he was set on an high place in the court, because he was of an illustrious birth.
The Brenton translation of the Septuagint is in the public domain.