Rehoboam also acted wisely by dispersing some of his sons throughout the districts of Judah and Benjamin, and to all the fortified cities. He gave them abundant provisions and sought many wives for them.
See here, I. How Rehoboam was strengthened by the accession of the priests and Levites, and all the devout and pious Israelites, to him, even all that were true to their God and their religion. 1. Jeroboam cast them off, that is, he set up such a way of worship as he knew they could not in conscience comply with, which obliged them to withdraw...
Commenting on 2 Chronicles 11:13-23
he dealt wisely--that is, with deep and calculating policy (Exo 1:10). and dispersed of all his children . . . unto every fenced city--The circumstance of twenty-eight sons of the king being made governors of fortresses would, in our quarter of the world, produce jealousy and dissatisfaction. But Eastern monarchs ensure peace and tranquillity to their kingdom by bestowing government offices on their sons and grandsons.
And he dealt wisely, and dispersed of all his children throughout all the countries of Judah and Benjamin, unto every fenced city: and he gave them victual in abundance. And he desired many wives. (h) He gave himself to have many wives.