You might have seen a pain scale in your doctor's office before. One common type shows a series of numbered cartoon faces moving from 0 (smiling and pain-free) to 10 (weeping in agony.) A doctor would ask a person in pain which face matched up with what they were feeling. They might seem simple.
In our day this might be more than one. For Israelite King Echov, one particular foreign wife, Isabel, was one too many. King David is said to have had eighteen wives and concubines, seven mentioned by name in the OT and the others mentioned in the oral tradition.
After this David became king over the tribe of Judah. One of Saul's sons was king over the other tribes. But when some of his own men killed him, David became king over all the Israelites. He made the city of Jerusalem the capital city. For seven years he was a king over the tribe of Judah and for thirty-three years he was the king over all the Israelites.