<P> The most important work of Byzantine law was the Ecloga, issued by Leo III, the first major Roman - Byzantine legal code issued in Greek rather than Latin . Soon after the Farmer's Law was established regulating legal standards outside the cities . While the Ecloga was influential throughout the Mediterranean (and Europe) because of the importance of Constantinople as a trading center, the Farmer's Law was a seminal influence on Slavic legal traditions including those of Russia . </P> <P> Byzantium inherited its main political, cultural and social institutions from Rome . Similarly, Roman law constituted the basis for the Byzantine legal system . For many centuries, the two great codifications of Roman law, carried out by Theodosius II and Justinian respectively, were the cornerstones of Byzantine legislation . Of course, over the years these Roman codes were adjusted to the current circumstances, and then replaced by new codifications, written in Greek . However, the influence of Roman law persisted, and it is obvious in codifications, such as Basilika, which was based on Corpus Juris Civilis . In the 11th century, Michael Psellos prides himself for being acquainted with the Roman legal legacy ("Ἰταλῶν σοφία"). </P> <P> In accordance with the late Roman legal tradition, the main source of law (fons legum) in Byzantium remained the enactments of the emperors . The latter initiated some major codifications of the Roman law, but they also issued their own "new laws", the Novels ("Novellae", "Νεαραὶ"). In early Byzantine (late Roman) era the legislative interest of the emperors intensified, and laws were now regulating the main aspects of public, private, economic and social life . For example, Constantine I was the first to regulate divorce and Theodosius I intervened in faith issues, imposing a specific version of the Creed . From Diocletian to Theodosius I, namely during approximately 100 years, more than 2,000 laws were issued . Justinian alone promulgated approximately 600 laws . Gradually, the legislative enthusiasm receded, but still some of the laws of later emperors, such as Leo III's Novels, are of particular importance . Custom continued to play a limited role as a secondary source of law, but written legislation had a precedence . </P> <P> There is no definitively established date for when the so - called Byzantine period of Roman history begins . During the 4th, 5th, and 6th centuries the Empire was split and united administratively more than once . But it was during this period that Constantinople was first established and the East gained its own identity administratively; thus, it is often considered the early Byzantine period . Despite this, though, the legal developments during this period are typically considered part of Roman Law, as opposed to Byzantine Law, in part because legal documents during this period were still written in Latin . These developments, nevertheless, were key steps in the formation of Byzantine Law . </P>

Who created a system of 400 laws for the byzantine empire
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