What Was Yashar in the Hebrew?

There are eight Kings in the south who were told did what was right in the eyes of the Lord. The same language basically is used to describe each of these asa and then Jehoshaphat. Hezekiah and Josiah, this is not the north, but in the south,. Who did what was Yashar, who did what wasright in the, in theeyes of theLord.