15 Years before, David had defeated Edom. Joab, his army commander, had stayed to bury some of the Israelite soldiers who had died in battle. While there, they killed every male in Edom.

Matthew Henry's Commentary on 1 Kings 11:15

Commentary on 1 Kings 11:14-25

(Read 1 Kings 11:14-25)

While Solomon kept close to God and to his duty, there was no enemy to give him uneasiness; but here we have an account of two. If against us, he can make us fear even the least, and the very grasshopper shall be a burden. Though they were moved by principles of ambition or revenge, God used them to correct Solomon.