Corpus Iuris Civilis was issued in three parts, in Latin, under
the direction of the imperial questor Tribonian at the request of
Emperor Justinian in 529-534. The first part was the Codex Justinianus
compiled all of the extant imperial constitutiones from the time of
Hadrian. It used both the Codex Theodosianus and private
collections such as the Codex Gregorianus and Codex Hermogenianus.
second part, the Digest (Digesta) or Pandects (Pandectae),
was issued in 533 : it compiled the writings of the great Roman
jurists such as Ulpian along with current edicts. The third part,
the Institutes (Institutiones), was intended as a sort of legal
textbook for law schools. Later, Justinian issued a number of other
laws, mostly in Greek, which were called Novels (Novellae).