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.
David was the eighth and youngest son of Jesse from the kingly tribe of Judah. He was also a direct descendent of Ruth the Moabite. David began his life as a shepherd in Bethlehem. One day, the prophet Samuel called him out of the field and anointed him without the knowledge of the current king, Saul. David simply returned to his sheep.