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The Roman Emperor Justinian I attempted to increase the unity of the Roman Empire by collecting and codifying the scattered laws, imperial edicts, decisions of the early Roman Senate, and opinions of learned jurists and organizing them into a written law code. The result was the Corpus Iurus Civilis (Body of Civil Law), issued in three parts. These parts were the Codex Justinianus (529), which compiled all of the extant imperial constitutiones from the time of Hadrian; the Digest, or Pandects, (533), which compiled the writings of the great Roman jurists such as Ulpian along with current edicts; and the Institutes, which was intended as sort of legal textbook for law schools and included extracts from the two major works.