1 Chronicles 1:50

And when Baal-hanan was dead, Hadad (or Hadar) reigned in his stead; and the name of his city was Pai; and his wife's name was Mehetabel, the daughter of Matred, the daughter of Mezahab. It appears from this that the country had no definite capital at this time, and that the royal power was not hereditary. Probably the ruler was elected from the total number of princes or most influential sheiks.