They were also the chief officers for King Solomon: 250 supervisors.
This we had Kg1 9:10-24, and therefore shall only observe here, I. Though Solomon was a man of great learning and knowledge, yet he spent his days, not in contemplation, but in action, not in his study, but in his country, in building cities and fortifying them, in a time of peace preparing for a time of war, which is as much a man's business...
Commenting on 2 Chronicles 8:1-11
two hundred and fifty that bare rule--(Compare Kg1 9:23). It is generally agreed that the text of one of these passages is corrupt.
And these [were] the chief of king Solomon's officers, [even] two hundred and fifty, that bare rule over the people. (f) For in all there were 3300 but here he means of them who had the principal charge, .