The new reference work for Roman private law covers the development from early Roman law to Justinian's codification. This is the first comprehensive work in fifty years which is abreast of current research. The work provides orientation by experts in view of the multitude of research subjects and constantly increasing secondary literature. It will also be of use to historians studying ancient history, classical philologists, other scholars of the humanities and legal professionals as a reference work and aspires to be a point of reference for international research on Roman law. It focuses on the discussion on late republican and imperial Roman jurists with reference to civil procedure, and uses epigraphical and papyrological material, also taking into account Roman law in the provinces.