He built the high gate of the house of the LORD, and on the wall of Ophel he built much.
He built the high gate of the house of the Lord - situated on the north-that portion of the temple hill which was high compared with the southern part; hence, "the higher," or upper gate, 2 Kings 15:35. "He built" -
i.e., repaired or embellished.
And on the wall of Ophel - the Ophel; i:e., the mound or eminence on the southeastern slope of the temple mount-a ridge lying between the valleys Kidron and Tyropoeon, called 'the lower city' (Josephus).
He built much - having the same desire as his father to secure the defense of Jerusalem in every direction.