Justinian aim in ordering the Code created in 529 was to simplify and harmonize numerous, sometimes conflicting laws. However, circumstances required that he continue to issue legislation in following years, so he incorporated these new laws into a second edition of the Code 534. This second edition is the only one that has come down to us. Justinian continued to legislate throughout his long reign (527-565).Most of the new laws were written in Greek, some in Latin, and a few in both, depending on the addressees. Read the entire here (pdf).