Joshua 12:9
The king of Jericho, one; the king of Ai, which is beside Beth–el, one;
Cross-reference
Joshua 6:2–21
Historical context
Joshua 6:2-21 details Jericho's fall — this verse summarizes that victory by listing its king.
Joshua 8:1
Prophetic fulfillment
Joshua 8:1 records God's promise to give Ai's king into Israel's hand — fulfilled in the list here.
Joshua 8:29–35
Parallel
Joshua 8:29-35 recounts Ai's king being hanged and covenant renewal — completing the story summarized in this verse.
Joshua 8:17
Historical context
Joshua 8:17 describes all men of Ai and Bethel pursuing Israel, leading to the city's capture and the king's defeat listed here.