Ahaziah of Judah or Jehoahaz I, was the sixth king of Judah, and the son of Jehoram and Athaliah, the daughter of king Ahab of Israel. He was also the first Judahite king to be descended from both the House of David and the House of Omri, through his mother and successor, Athaliah.
According to 2 Kings 8:26, Ahaziah was 22 years old when he began to reign, and reigned for one year in Jerusalem. 2 Chronicles 22:2 gives his age as 42 years when his reign began in Jerusalem. Most scholars regard the 42 years in 2 Chronicles 22:2 as a copyist's error for an original 22 years. The age of 22 is also found in some Greek and Syrian versions of 2 Chronicles 22:2.
William F. Albright has dated his reign to 842 BC, while E. R. Thiele offers the date 841/840 BC. As explained in the Rehoboam article, Thiele's chronology for the first kings of Judah contained an internal inconsistency that placed Ahaziah's reign one year after his mother Athaliah usurped the throne. Later scholars corrected this by dating these kings one year earlier, so that Ahaziah's dates are taken as one year earlier than Thiele's in the present article.