He built Elath
A port which belonged to Edom, ( Deuteronomy 2:8 ) ( 1 Kings 9:26 ) which very probably David took from them when he made them tributary, and which they retook when they revolted, and Amaziah got again when he defeated them; and this his son rebuilt and fortified:
and restored it to Judah;
annexed it to the kingdom of Judah, as in the days of David and Solomon:
after that the king slept with his fathers;
after the death of his father Amaziah.