Disputes are bound to happen in a human society. For this reason, various methods of dispute resolution have been developed since the ancient time. This article focuses on the history of dispute resolution from the Sukhothai kingdom era until the Rattanakosin kingdom era. In this era, principles and rules of dispute resolution are prescribed on Ramkhamhaengûs stone inscription. Some of the rules and principles used in those eras become an important source of current dispute resolution rules and principles. This article also gives a detailed explanation on arbitration and mediation, which are the two common forms of alternative dispute resolution.