Late Antiquity encompasses a period in which many events affected the history of the world. During this period, intensive studies were conducted in the field of law in the Eastern Roman Empire. Especially in the reign of the emperor Justinian I. Corpus Juris Civilis called the law collections formed the basis of today's European law. Many changes had been made to this law collection in the ongoing process due to the dynamic nature of the law. After Justinian I, his successors, who were seated on the throne of the Eastern Roman Empire, contributed to the discovery of valuable works in this area. The work called Ecloga is the first short example of Corpus Juris Civilis in Greek especially prepared by Leo III and developed by contemporaries seen as first law book by historians of law. The texts of law that emerged in the Late Antiquity had a profoundly affect Eastern Roman Empire in particular, and on the whole of the Near East and Europe in general.