Esan kingdoms had a varying degree of autonomy, but were ultimately controlled by the Benin Empire. The Oba approved the of Esanland, and Esan kingdoms paid tribute to Benin. Yet, several wars between Esan kingdoms and Benin were recorded. This was due to the Oba, at ascension on the throne, sending white chalk to the Esans as a term of friendship. If the chalk was rejected, then the Oba would try to invade Esanland. The varying political stabilities of Benin and the Esan kingdoms also led to warfare. Such warfare was so common that there is no recorded history of peace between all of the Esan kingdoms and Benin.