NET
4 Jehoram took control of his father’s kingdom and became powerful. Then he killed all his brothers, as well as some of the officials of Israel.
Darby
4 And Jehoram established himself over the kingdom of his father, and strengthened himself; and he slew all his brethren with the sword, and [certain] also of the princes of Israel.
KJV
4 Now when Jehoram was risen up to the kingdom of his father, he strengthened himself, and slew all his brethren with the sword, and [divers] also of the princes of Israel.