|Easton's Bible Dictionary|
Subdued by God.
(1.) A city of Judah near Lachish (Joshua 15, 38). Perhaps the ruin Kutlaneh, south of Gezer.
(2.) Amaziah, king of Judah, undertook a great expedition against Edom (2 Chronicles 25:5-10), which was completely successful. He routed the Edomites and slew vast numbers of them. So wonderful did this victory appear to him that he acknowledged that it could have been achieved only by the special help of God, and therefore he called Selah (q.v.), their great fortress city, by the name of Joktheel (2 Kings 14:7).
Int. Standard Bible Encyclopedia
jok'-the-el, jok'-thel (yoqethe'el):
(1) A city in the Shephelah of Judah named between Mizpeh and Lachish (Joshua 15:38); unidentified.
(2) A city in Edom formerly called Sela, taken by Amaziah after the battle in the Valley of Salt, and by him called Joktheel (2 Kings 14:7).
Joktheel (2 Occurrences)
Joshua 15:38 Dilean, Mizpeh, Joktheel, (WEB KJV JPS ASV BBE DBY WBS YLT NAS NIV)
2 Kings 14:7 He killed of Edom in the Valley of Salt ten thousand, and took Sela by war, and called its name Joktheel, to this day. (WEB KJV JPS ASV BBE DBY WBS YLT NAS NIV)