The Chinese Empire conveniently dates from 221 B.C., when the King of Ch’in coined the title which has since served for Emperor, and with considerable justness designated himself The First Emperor. Conqueror though he was, he left much still to be done in the process of consolidating under one imperial sovereignty all the kingdoms and tribes of the area which is now north and central China. During the pre-imperial era, intercourse among the rulers of the independent units naturally had a customary pattern, an Asiatic analogue to the rudimentary interstate law of the Greek city states. Two bloody centuries preceding The First Emperor have left much martial romance and philosophy both militant and pacifistic, but meager history. From a relatively quiet earlier period, 722-481, however, the classic annals transmit an abundance of critically acceptable history in palpable detail, with interstate incidents suitable for the purpose of case studies. This paper is limited to the first twenty years of that period, the earliest possible for its purpose, which is to induce interstate custom solely from episodes credibly recorded in Chinese classics. Only a few illustrative cases are quoted here, but all the generalizations rest wholly upon case studies unless specifically noted otherwise.