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This is because after winning independent slave trade also was in that event, or because Europeans wanted to influence Christians into Africa.
One reason the Justinian Code was significant was that it (1) became the foundation of the modern legal systems of many Western countries. The Justinian Code has a major influence on public international law and laid the foundation for Western legal tradition. It was ordered by Justinian I who was Emperor of the Eastern Roman Empire, which was seen as East of the Greek Isles.