Hezekiah began reigning as his father Ahaz's vice-regent in 729 B.C. and ruled as such for 14 years. In 715 B.C. he began his sole rule over Judah that lasted until 697 B.C. (18 years). He then reigned with his son Manasseh who served as his vice-regent for 11 more years (697-686 B.C.). His 29-year reign (v. 2) was from 715-686 B.C.114
The writer recorded that only three other kings did right as David had done: Asa (1 Kings 15:11), Jehoshaphat (2 Chron. 17:3), and Josiah (2 Kings 22:2). These were Judah's reforming kings. The only other king he said removed the high places (v. 4) was Jehoshaphat (2 Chron. 17:6). Someone must have rebuilt them after he removed them. Nehushtan (v. 4) was the name that someone had given to Moses' bronze serpent. This word in Hebrew sounds similar to the Hebrew words for bronze, snake, and unclean thing. The Israelites had come to worship the object that had been a symbol of Yahweh's healing grace.
Regarding his faith Hezekiah was the greatest Judahite king (v. 5). He did not depart from Yahweh later in life (v. 6). Consequently God's blessing rested on him (v. 7; cf. 2 Chron. 29-31). His rebellion against Sennacherib (v. 7) precipitated Assyria's invasion of Judah (18:3-19:36). This was a reversal of his father Ahaz's policy of allying with Assyria (16:7-9). God gave him consistent victory over the Philistines (v. 8).
Verses 9-12 serve a double purpose. They relate the Assyrian defeat of Samaria to Hezekiah's reign, and they explain again the spiritual reason for that defeat (v. 12). Hezekiah's fourth year (v. 9) was 725 B.C., the fourth year of his coregency with Ahaz.
