He rules way before he came to power. Under his father rules, he was in charge secretly almost during 10 years.
This is a bit misleading. Justinian's father was not an emperor, it was his adoptive father Justin that preceded him as emperor. The key here is "adoptive": Byzantine monarchy was dual in that there was a main ruler and a "junior emperor" which tended to hold the office of "Caesar" in the imperial court before being crowned co-emperor. Justinian in particular was a consul before his adoptive father's death and his own subsequent coronation as sole ruler. So the fact that Justinian exerted political influence before becoming the official emperor was actually the system working accordingly. This is similar to Basil the Macedonian's ascension to power, minus the fact Justinian didn't order his senior emperor's assassination to become sole emperor.
If a great leader is a absolute monarch that know and control everything, well Justinian isn't your guy. Justinian strength's is to be able to choose the right person for the right task. When he wants to do something and don't know how: he delegates to someone competent. He wasn't a fervent and spiritual leader, nor a military mastermind. But his legacy was:
- The Corpus Juris Civilis: Compilation of the byzantine laws, making the same law for everybody. It's Tribonian work's.
- Social Policies: Reduce the inegalties between rich and poor (slaves and small farmer), and women and men. Poor have free access to justice and inhumation. It's mostly Theodora works.
- Tax Reform: Due to christian ideology, rich pays more and becoming rich by exploiting is on the fall (slavery still in effect). It's John the Cappadocian works.
- Builder: Hagia Sophia is rebuilt, as many others edifices all over the empire. Theodose wall is complete and byzantine art rise. It's Justinian I's works.
- Military expansion and defense: the dream of an unified roman empire with Rome in it. It's Belisiarus (and Narses) works.
I don't disagree with that, that's not what my problem is though. When I mention competence, I am judging outcomes and deeds more so than his own individual involvement. There's no shame in being an emperor "behind the curtains", it's just that his choices politically and militarily were not all that great.
Theodora was a great woman. Mostly because Justinian I was maybe the first ruler to really listen his wife. But I disagree: she wasn't in power (except during the Plague period). She have power and she uses it, but Justinian I ruled.
Theodora was officially co-regent of the Roman empire thus she was by definition Justinian's (junior) co-ruler. A lot of women in Roman history have had great influence on emperors, particularly mothers of emperors. Anna Dalassene (Alexios' mother) effectively ran the empire while her son was out campaigning in the early years of his reign.
Also, it's not just that Justinian listened to Theodora, Theodora exerted great influence on Justinian. The Nika riots are a great example of this, but a lot of strategic decisions happened by consulting Theodora as well. She was more competent in much of what is attributed to her own judgement, but of course she had her (many) flaws as well and Justinian still had the final say in everything.
Justinian faced a lot of disaster: earthquake, plague, extrem weather events, riots, making ruling difficult and wasted a lot of gold to rebuild everything as well as to pay for his military and people to bankrupt.
Many people even attribute much of the spread of the plague to Justinian's poor response to the outbreak, but on that I am skeptical. I agree that Justinian wasn't blessed with the best of luck.
If I may ask, which "office" are you referring to then, before details? Monarchy was long established before Qin if you are talking about the form of government.
The office of "emperor of the Qin (and by extension China)". As I've said, Qin Shi Huang was the first one to hold that office, hence his name.
Before him, there was already a strong identity of who was Chinese. They referred people in the more northern region as "Chinese"/"Central Kingdom" while the others, including the southern part and the western region where Qin ruled, were viewed as "Barbarians". I shall direct you to
wiki.
"Zhongguo" is in fact the central or middle kingdom, it doesn't make any reference to ethnicity or culture. Chinese ethnic identity as it is perceived today is "Han Chinese", Han itself deriving from the Han dynasty. That is the endonym used today for the people and the language of the Chinese people. That is why I mentioned core Chinese territory including the south.
Qin's importance was to reconquer the fragmented lands in the previous dynasty (and some more) back into an empire, which quickly collapsed and became the step stone of the Han dynasty, which was a golden age.
His importance is a subjective matter, so I don't think that definite statements apply. But what he did which is in fact a historically significant event is establishing the Chinese empire whose head of state remained the dominant political office of the realm(s) for millenia to come.
His ruthlessness and vanity towards building the Great Wall and wonders were far more famous than his legacy.
Not a fair assessment, I'd say. The thing isn't that Qin Shi Huang is some figure remembered for one thing instead of another, he is just not a famous figure in western literature in general, whereas the Terra Cotta army and the Great Wall are famous world wonders. The fact he is known as Qin Shi Huang shows that historically his legacy is centered around his one major political accomplishment.
Sorry to diverge the discussions to this far. The point is to compare Qin's work with Justinian's. They did similar things: massive building, wasting resources and reconquering. Qin was praised, as the succeeding dynasty rose from the damage and prospered. While Justinian was controversial, as his legacy became vain when no one was able to hold it. I imagine people will mock Qin's miscalculation and impracticability, if China was split up soon after his death.
The fact we are going along the tangent of history is quite the divergence, so don't worry much about that. If anything, I think I'm the main culprit here :^)
Qin Shi Huang's rule and Justinian's rule have some vague similarities, but other than that there is a very large dissonance. For one, Qin's major building project was purely defensive which despite its impracticality did work as something more than just a sign of wealth and power. Before Qin, there was no one single Chinese empire, at least not as we know it today. He united the warring states of the north and expanded into previously unconquered territory. Justinian inherited and passed through the exact same polity and political office with several previously Roman lands retaken. The resource thing is definite debatable as I have not found anything about the expenses of Qin Shi Huang's campaigns, so I'll leave that up as possible.
Justinian was definitely praised, he is the only Roman emperor of the "Byzantine" era that has received the epithet "the Great". Now, whether Qin Shi Huang is as overrated as Justinian in that manner, I doubt it, but even assuming he is, there are more things to him than the Justinian parallelisms. After all, I would be reluctant to attribute the fragmentation of the empire upon its leader's death solely on him. Mismanagement during his rule is a definite factor in many cases indeed, but that doesn't take away any blame on his successors. For example, the Byzantine empire crumbled following the battle of Manzikert, less than 50 years after Basil's death. Is it Basil's fault that his brother and the next 1-2 rulers after that were completely inept?
So I won't judge a leader only by long-turn legacy --as legacy can soon be lost if a successor can not turn it into his own legacy.
Sidenote here: I see you are using the term "legacy" a lot, but it's not exactly my point. Effect isn't legacy. I'm not saying Justinian's legacy is poor, in fact it's quite (over)glorified and constantly praised among many people. It's the long-term effects of his choices that were undeniably bad. Legacy is a purely subjective thing based on public perception. Effects are merely the direct (or indirect) consequences and repercussions of a ruler's policies.
One example of contradicting legacy and effect other than Justinian is Nero. Nero has a terrible legacy, having an image of being inept and a tyrant that set Rome on fire and hunted Christians down. That however contradicts what he actually did and many of the good decisions he made which had positive effects in Rome's future such as the rebuilding of Rome following the great fire (which he didn't cause). Is he a great emperor? Certainly not, but because he isn't as bad as he is often remembered, he is by extension seen in a much more positive light today.
Your reasons to criticize Justinian's work have their standing though, but they will not render him a lesser leader compared to the others.
It depends on who the "others" are. Alexios and Basil? His mistakes definitely make him a lesser emperor than those. Other random Byzantine rulers? It depends on whom you're drawing the comparison with. Justinian is way better than Phocas, Constantine VIII or Alexios Angelos, that's for sure.