《韩非子·外储说右下》
卫君去朝见周天子，周外交官问卫君的名号，卫君回答说： 诸侯辟疆。 
卫君入朝于周，周行人问其号，对曰： 诸侯辟疆。 
Lord Wei went to meet the Emperor Zhou, and the Zhou diplomat asked Lord Wei's name, and Lord Wei replied: The vassals have opened up the territory.