Answer:
Justinian assumed the throne in 527 and the following year, on February 13, 528, he issued a homicidal constitution by the name of haec quae necessary because these are the first words that head his text. By this constitution designated a commission composed of ten members, chaired by Juan de Cappadocia and integrated by the famous Teófilo and the Tribal magister officiorum, to make a compilation of laws or imperial constitutions until then in force, which were fundamentally taken from the Gregorian codes, Hermogenian and Theodosian. After fourteen months of intense work, the Commission presented the project to the emperor, promulgated on April 7, 529 by the summa republicae constitution.