Proverbs 28:2
For the transgression of a land many are the princes thereof: but by a man of understanding and knowledge the state thereof shall be prolonged. For the transgression of a land many are the princes thereof: but by a man of understanding and knowledge the state thereof shall be prolonged.
The saying stands within the block that runs from chapter 25 through chapter 29. That block is a collected body of Solomon's proverbs connected with Hezekiah. Hezekiah lived three hundred years after Solomon.