Then Jehoshaphat his son reigned in his place, and strengthened himself against Israel.
Surrounding context
17:1 Then Jehoshaphat his son reigned in his place, and strengthened himself against Israel.
17:2 And he placed troops in all the fortified cities of Judah, and set garrisons in the land of Judah and in the cities of Ephraim which Asa his father had taken.