ANSWER:
D- separation of powers
The Corpus Juris (or Iuris) Civilis ("Body of Civil Law") is the modern name for a collection of fundamental works in jurisprudence, issued from 529 to 534 by order of Justinian I, Eastern Roman Emperor. ... The work was directed by Tribonian, an official in Justinian's court in Constantinople.
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The answer of your question
The fertile land which was good for growing wheat.
