“Rehoboam was 41 years old when he began to reign.” The fact that Rehoboam was 41 when he became king the year Solomon died, and Solomon had reigned 40 years, means that Rehoboam was born before David died and Solomon became king. So Solomon already had at least one wife, Naamah, who was an Ammonite, before he married Pharaoh’s daughter (1 Kings 3:1).