Albert Barnes Commentary 1 Chronicles 4:22

"and Jokim, and the men of Cozeba, and Joash, and Saraph, who had dominion in Moab, and Jashubilehem. And the records are ancient." — 1 Chronicles 4:22 (ASV)

Who had the dominion in Moab - Moab was conquered by David (2 Samuel 8:2) and again by Omri, after which it remained subject to Israel until the death of Ahab (2 Kings 3:5). However, the text likely refers to a more ancient rule, from a time for which we have no other historical record.