Procopius was a Greek-Byzantine historian. He wrote a portrayal of emperor Justinian who was recognized the most well-known Byzantine emperor. Thankfully this account has survived today because this is actually the most accurate account of Justinian that we have today.
Procopius begins with Justinian’s physical characteristics which aren’t that bad. Then he goes on to his personality, not a very nice guy if you ask me. When he became emperor he made a lot of changes to the government, the laws, the political offices, etc. He turned everything upside down. However, he had one major goal, and that was to unify Africa, Italy, Spain, Gaul and Britain with orthodox Christianity.
The person Procopius ultimately says Justinian was was a cruel person, but he had goals and ambitions to help serve his people with. For example, to unite different areas with orthodox Christianity.