Jehoram

Jehoram steps into the kingship solely because Ahaziah died without a son — his succession is a footnote that underscores how little Ahaziah's reign ultimately produced.

Jehoram is being introduced to the reader with a famously backhanded assessment — he removed the Baal pillar his father built, but kept the systemic idol worship Jeroboam had embedded in the kingdom.

Jehoram is the king of Judah whose reign is summarized in devastating brevity — he walked in the corrupt ways of Ahab's dynasty because he married into it, and his kingdom suffered accordingly.

Jehoram is shown taking his first act as king — executing all six of his brothers along with key officials, eliminating threats that didn't exist simply because he could.

Jehoram is mentioned here as Ahaziah's deceased father, whose death left the young king without paternal guidance and made him entirely dependent on his mother's destructive counsel.