The Code of Justinian, also known as one of the four parts of the <em>Corpus Juris Civilis</em>, was a collection of Roman laws and byzantine reforms that was ordered by the <em><u>Byzantine emperor Justinian I</u></em> (who ruled over Constantinople from 527 to 565 CE).
The Code of Justinian wasn't a new legal code but actually a compilation of the legal interpretations of past laws with the addition of the opinions of Roman Jurists.